See 
https://uberchromegw.corp.google.com/i/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/25548
https://uberchromegw.corp.google.com/i/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/25549
https://uberchromegw.corp.google.com/i/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/25550
https://uberchromegw.corp.google.com/i/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/25551
https://uberchromegw.corp.google.com/i/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/25552
https://uberchromegw.corp.google.com/i/chromium.memory/builders/Mac%20ASan%2064%20Tests%20%281%29/builds/25553


Sample failure:
[ RUN      ] AppControllerNewProfileManagementBrowserTest.GuestProfileReopenWithNoWindows
[66974:52251:1215/023931.065689:WARNING:mac_util.mm(222)] Failed to set backup exclusion for file '/private/var/folders/9x/6c6sv3cj4j53wzpzthbp4ksm0000gm/T/.org.chromium.Chromium.X26KII/dopYAnp/Default/History': Error Domain=NSOSStatusErrorDomain Code=-50 "The operation couldn?t be completed. (OSStatus error -50.)" (paramErr: error in user parameter list) (-50)
[66974:52251:1215/023931.236413:WARNING:mac_util.mm(222)] Failed to set backup exclusion for file '/private/var/folders/9x/6c6sv3cj4j53wzpzthbp4ksm0000gm/T/.org.chromium.Chromium.X26KII/dopYAnp/Default/Favicons': Error Domain=NSOSStatusErrorDomain Code=-50 "The operation couldn?t be completed. (OSStatus error -50.)" (paramErr: error in user parameter list) (-50)
[66984:3335:1215/023931.513937:WARNING:vt_video_decode_accelerator_mac.cc(169)] Failed to create VTDecompressionSession: Error Domain=NSOSStatusErrorDomain Code=-8973 "The operation couldn?t be completed. (OSStatus error -8973.)" (codecOpenErr) (-8973)
[66984:3335:1215/023931.516475:WARNING:vt_video_decode_accelerator_mac.cc(191)] Failed to create hardware VideoToolbox session
[66984:3335:1215/023931.618419:ERROR:vt_video_encode_accelerator_mac.cc(518)]  VTCompressionSessionCreate failed: -12908
[66974:95751:1215/023932.338248:WARNING:mac_util.mm(222)] Failed to set backup exclusion for file '/private/var/folders/9x/6c6sv3cj4j53wzpzthbp4ksm0000gm/T/.org.chromium.Chromium.X26KII/dopYAnp/System Profile/History': Error Domain=NSOSStatusErrorDomain Code=-50 "The operation couldn?t be completed. (OSStatus error -50.)" (paramErr: error in user parameter list) (-50)
[66974:105987:1215/023932.454676:WARNING:mac_util.mm(222)] Failed to set backup exclusion for file '/private/var/folders/9x/6c6sv3cj4j53wzpzthbp4ksm0000gm/T/.org.chromium.Chromium.X26KII/dopYAnp/Guest Profile/History': Error Domain=NSOSStatusErrorDomain Code=-50 "The operation couldn?t be completed. (OSStatus error -50.)" (paramErr: error in user parameter list) (-50)
[66974:95751:1215/023932.726880:WARNING:mac_util.mm(222)] Failed to set backup exclusion for file '/private/var/folders/9x/6c6sv3cj4j53wzpzthbp4ksm0000gm/T/.org.chromium.Chromium.X26KII/dopYAnp/System Profile/Favicons': Error Domain=NSOSStatusErrorDomain Code=-50 "The operation couldn?t be completed. (OSStatus error -50.)" (paramErr: error in user parameter list) (-50)
[66974:105987:1215/023932.804656:WARNING:mac_util.mm(222)] Failed to set backup exclusion for file '/private/var/folders/9x/6c6sv3cj4j53wzpzthbp4ksm0000gm/T/.org.chromium.Chromium.X26KII/dopYAnp/Guest Profile/Favicons': Error Domain=NSOSStatusErrorDomain Code=-50 "The operation couldn?t be completed. (OSStatus error -50.)" (paramErr: error in user parameter list) (-50)
[66974:68891:1215/023932.809202:ERROR:mach_port_broker.mm(175)] Unknown process 66995 is sending Mach IPC messages!
[66974:39427:1215/023932.845917:ERROR:service_manager_context.cc(143)] Attempting to run unsupported native service: /b/swarm_slave/w/ir0nsywT/out/Release/./content_browser/content_browser.service
[66974:39427:1215/023932.846631:FATAL:interface_endpoint_client.cc(32)] Check failed: !is_valid. The callback passed to Connector::Connect() was never run.
0   browser_tests                       0x000000011047cfa3 _ZN4base5debug10StackTraceC1Ev + 19
1   browser_tests                       0x00000001104ddd40 _ZN7logging10LogMessageD2Ev + 336
2   browser_tests                       0x000000011479d37e _ZN4mojo12_GLOBAL__N_115DCheckIfInvalidERKN4base7WeakPtrINS_23InterfaceEndpointClientEEERKNSt3__112basic_stringIcNS7_11char_traitsIcEENS7_9allocatorIcEEEE + 734
3   browser_tests                       0x000000011479cb65 _ZN4mojo12_GLOBAL__N_114ResponderThunk13DCheckInvalidERKNSt3__112basic_stringIcNS2_11char_traitsIcEENS2_9allocatorIcEEEE + 437
4   browser_tests                       0x000000010bcb4deb _ZN4base8internal9BindStateIMN15service_manager5mojom34Connector_Connect_ProxyToResponderEFvNS3_13ConnectResultERKNSt3__112basic_stringIcNS6_11char_traitsIcEENS6_9allocatorIcEEEEEJNS0_13PassedWrapperINS6_10unique_ptrIS4_NS6_14default_deleteIS4_EEEEEEEED2Ev + 491
5   browser_tests                       0x000000010bcb4be6 _ZN4base8internal9BindStateIMN15service_manager5mojom34Connector_Connect_ProxyToResponderEFvNS3_13ConnectResultERKNSt3__112basic_stringIcNS6_11char_traitsIcEENS6_9allocatorIcEEEEEJNS0_13PassedWrapperINS6_10unique_ptrIS4_NS6_14default_deleteIS4_EEEEEEEE7DestroyEPKNS0_13BindStateBaseE + 22
6   browser_tests                       0x000000010c017fd3 _ZN15service_manager13ConnectParamsD1Ev + 35
7   browser_tests                       0x000000010c03af1b _ZN4base8internal13FunctorTraitsIMN15service_manager14ServiceManagerEFvNSt3__110unique_ptrINS2_13ConnectParamsENS4_14default_deleteIS6_EEEEN4mojo12InterfacePtrINS2_5mojom7ServiceEEEbNS_7WeakPtrINS3_8InstanceEEENSA_9StructPtrINSC_13ResolveResultEEEEvE6InvokeIRKNSF_IS3_EEJS9_SE_RKbRKSH_SK_EEEvSM_OT_DpOT0_ + 1307
8   browser_tests                       0x000000010c03a817 _ZN4base8internal7InvokerINS0_9BindStateIMN15service_manager14ServiceManagerEFvNSt3__110unique_ptrINS3_13ConnectParamsENS5_14default_deleteIS7_EEEEN4mojo12InterfacePtrINS3_5mojom7ServiceEEEbNS_7WeakPtrINS4_8InstanceEEENSB_9StructPtrINSD_13ResolveResultEEEEJNSG_IS4_EENS0_13PassedWrapperISA_EENSP_ISF_EEbSI_EEEFvSL_EE7RunImplIRKSN_RKNS5_5tupleIJSO_SQ_SR_bSI_EEEJLm0ELm1ELm2ELm3ELm4EEEEvOT_OT0_NS_13IndexSequenceIJXspT1_EEEEOSL_ + 1079
9   browser_tests                       0x000000010bcba235 _ZN15service_manager5mojom42Resolver_ResolveMojoName_ForwardToCallback6AcceptEPN4mojo7MessageE + 757
10  browser_tests                       0x0000000114797d65 _ZN4mojo23InterfaceEndpointClient22HandleValidatedMessageEPNS_7MessageE + 2773
11  browser_tests                       0x00000001147966f1 _ZN4mojo11FilterChain6AcceptEPNS_7MessageE + 513
12  browser_tests                       0x000000011479afd9 _ZN4mojo23InterfaceEndpointClient21HandleIncomingMessageEPNS_7MessageE + 281
13  browser_tests                       0x00000001147adc31 _ZN4mojo8internal15MultiplexRouter22ProcessIncomingMessageEPNS_7MessageENS1_18ClientCallBehaviorEPN4base22SingleThreadTaskRunnerE + 2513
14  browser_tests                       0x00000001147ac801 _ZN4mojo8internal15MultiplexRouter6AcceptEPNS_7MessageE + 609
15  browser_tests                       0x00000001147966f1 _ZN4mojo11FilterChain6AcceptEPNS_7MessageE + 513
16  browser_tests                       0x000000011478b7dc _ZN4mojo9Connector17ReadSingleMessageEPj + 604
17  browser_tests                       0x000000011478c3b4 _ZN4mojo9Connector21OnHandleReadyInternalEj + 452
18  browser_tests                       0x00000001147cb213 _ZN4mojo7Watcher13OnHandleReadyEj + 595
19  browser_tests                       0x00000001147cac8b _ZN4mojo7Watcher17CallOnHandleReadyEmj22MojoHandleSignalsStatej + 523
20  browser_tests                       0x000000011673441d _ZN4mojo3edk7Watcher19MaybeInvokeCallbackEjRKNS0_18HandleSignalsStateEj + 525
21  browser_tests                       0x000000011672091b _ZN4mojo3edk14RequestContextD2Ev + 1275
22  browser_tests                       0x0000000116720923 _ZN4mojo3edk14RequestContextD2Ev + 1283
23  browser_tests                       0x0000000116720923 _ZN4mojo3edk14RequestContextD2Ev + 1283
24  browser_tests                       0x00000001166e97ad _ZN4mojo3edk11NodeChannel16OnChannelMessageEPKvmNSt3__110unique_ptrINS4_6vectorINS0_14PlatformHandleENS4_9allocatorIS7_EEEENS0_27PlatformHandleVectorDeleterEEE + 10477
25  browser_tests                       0x00000001166a5a8f _ZN4mojo3edk7Channel14OnReadCompleteEmPm + 1903
26  browser_tests                       0x00000001166a9f93 _ZN4mojo3edk12_GLOBAL__N_112ChannelPosix28OnFileCanReadWithoutBlockingEi + 1411
27  browser_tests                       0x0000000110524905 _ZN4base19MessagePumpLibevent22OnLibeventNotificationEisPv + 1189
28  browser_tests                       0x0000000113ed026d event_base_loop + 4061
29  browser_tests                       0x000000011052520c _ZN4base19MessagePumpLibevent3RunEPNS_11MessagePump8DelegateE + 1196
30  browser_tests                       0x0000000110519a51 _ZN4base11MessageLoop10RunHandlerEv + 817
31  browser_tests                       0x00000001105a845a _ZN4base7RunLoop3RunEv + 362
32  browser_tests                       0x000000011064e964 _ZN4base6Thread3RunEPNS_7RunLoopE + 468
33  browser_tests                       0x000000010e6420cd _ZN7content17BrowserThreadImpl11IOThreadRunEPN4base7RunLoopE + 237
34  browser_tests                       0x000000010e6424ec _ZN7content17BrowserThreadImpl3RunEPN4base7RunLoopE + 716
35  browser_tests                       0x000000011064f5e1 _ZN4base6Thread10ThreadMainEv + 1841
36  browser_tests                       0x000000011063aa9e _ZN4base12_GLOBAL__N_110ThreadFuncEPv + 206
37  libsystem_pthread.dylib             0x00007fff8d9b9899 _pthread_body + 138
38  libsystem_pthread.dylib             0x00007fff8d9b972a _pthread_struct_init + 0
39  libsystem_pthread.dylib             0x00007fff8d9bdfc9 thread_start + 13