[72453:40195:0912/142104:FATAL:url_request.cc(121)] Check failed: !connect_timing->connect_end.is_null(). 
0   libbase.dylib                       0x0000000109727dc3 _ZN4base5debug10StackTraceC1Ev + 19
1   libbase.dylib                       0x000000010974ca87 _ZN7logging10LogMessageD2Ev + 71
2   libnet.dylib                        0x000000010a9212dc _ZN3net10URLRequest17OnHeadersCompleteEv + 668
3   libnet.dylib                        0x000000010a931406 _ZN3net13URLRequestJob21NotifyHeadersCompleteEv + 166
4   libnet.dylib                        0x000000010a92bcd3 _ZN3net17URLRequestHttpJob21NotifyHeadersCompleteEv + 1267
5   libnet.dylib                        0x000000010a92cbae _ZN3net17URLRequestHttpJob35SaveCookiesAndNotifyHeadersCompleteEi + 494
6   libnet.dylib                        0x000000010a92a22c _ZN3net17URLRequestHttpJob16OnStartCompletedEi + 1052
7   libnet.dylib                        0x000000010a76c248 _ZN3net9HttpCache11Transaction6DoLoopEi + 3976
8   libnet.dylib                        0x000000010a77fc06 _ZN3net22HttpNetworkTransaction10DoCallbackEi + 214
9   libnet.dylib                        0x000000010a7f3f44 _ZN3net14QuicHttpStream10DoCallbackEi + 244
10  libnet.dylib                        0x000000010a7ff9d3 _ZN3net24QuicChromiumClientStream31NotifyDelegateOfHeadersCompleteENS_15SpdyHeaderBlockEm + 323
11  libnet.dylib                        0x000000010a800078 _ZN4base8internal7InvokerINS0_9BindStateIMN3net24QuicChromiumClientStreamEFvNS3_15SpdyHeaderBlockEmEJNS_7WeakPtrIS4_EENS0_13PassedWrapperIS5_EEmEEEFvvEE7RunImplIRKS7_RKNSt3__15tupleIJS9_SB_mEEEJLm0ELm1ELm2EEEEvOT_OT0_NS_13IndexSequenceIJXspT1_EEEE + 184
12  libbase.dylib                       0x00000001097284d9 _ZN4base5debug13TaskAnnotator7RunTaskEPKcRKNS_11PendingTaskE + 201
13  libbase.dylib                       0x0000000109761fec _ZN4base11MessageLoop7RunTaskERKNS_11PendingTaskE + 572
14  libbase.dylib                       0x000000010976233c _ZN4base11MessageLoop21DeferOrRunPendingTaskENS_11PendingTaskE + 44
15  libbase.dylib                       0x0000000109762743 _ZN4base11MessageLoop6DoWorkEv + 371
16  libbase.dylib                       0x00000001097651c2 _ZN4base19MessagePumpLibevent3RunEPNS_11MessagePump8DelegateE + 98
17  libbase.dylib                       0x0000000109761b97 _ZN4base11MessageLoop10RunHandlerEv + 215
18  libbase.dylib                       0x0000000109790503 _ZN4base7RunLoop3RunEv + 51
19  libbase.dylib                       0x00000001097d11f7 _ZN4base6Thread3RunEPNS_7RunLoopE + 199
20  libcontent.dylib                    0x000000010b736b48 _ZN7content17BrowserThreadImpl11IOThreadRunEPN4base7RunLoopE + 24
21  libcontent.dylib                    0x000000010b736cd6 _ZN7content17BrowserThreadImpl3RunEPN4base7RunLoopE + 294
22  libbase.dylib                       0x00000001097d1685 _ZN4base6Thread10ThreadMainEv + 693
23  libbase.dylib                       0x00000001097c8748 _ZN4base12_GLOBAL__N_110ThreadFuncEPv + 104
24  libsystem_pthread.dylib             0x00007fff8ed6e99d _pthread_body + 131
25  libsystem_pthread.dylib             0x00007fff8ed6e91a _pthread_body + 0
26  libsystem_pthread.dylib             0x00007fff8ed6c351 thread_start + 13

This happens on Mac "trashcan" with AMD GPU and Mac Retina laptop (with NVidia/Intel). Both are running MacOSX 10.11.6.