Findit identified the culprit r582162 with confidence 78.4% in the config "chromium.chromiumos / linux-chromeos-rel"
based on the flakiness trend:

https://findit-for-me.appspot.com/waterfall/flake?key=ag9zfmZpbmRpdC1mb3ItbWVy0wELEhdNYXN0ZXJGbGFrZUFuYWx5c2lzUm9vdCKcAWNocm9taXVtLmNocm9taXVtb3MvbGludXgtY2hyb21lb3MtcmVsLzExNzY4L3VuaXRfdGVzdHMvVjJWaVVuUmpSWFpsYm5STWIyZE5ZVzVoWjJWeVZHVnpkQzVUZEdGeWRGSmxiVzkwWlV4dloyZHBibWRFYjJWelRtOTBVbVYwZFhKdVNXUlhhR1Z1Vlc1emRXTmpaWE56Wm5WcwwLEhNNYXN0ZXJGbGFrZUFuYWx5c2lzGAEM

If the culprit above is wrong, please file a bug using this link and hit submit:
https://bugs.chromium.org/p/chromium/issues/entry?status=Unconfirmed&labels=Pri-1,Test-Findit-Wrong&components=Tools%3ETest%3EFindit%3EFlakiness&summary=%5BFindit%5D%20Flake%20Analyzer%20-%20Wrong%20result%20for%20WebRtcEventLogManagerTest.StartRemoteLoggingDoesNotReturnIdWhenUnsuccessful&comment=Link%20to%20Analysis%3A%20https://findit-for-me.appspot.com/waterfall/flake?key=ag9zfmZpbmRpdC1mb3ItbWVy0wELEhdNYXN0ZXJGbGFrZUFuYWx5c2lzUm9vdCKcAWNocm9taXVtLmNocm9taXVtb3MvbGludXgtY2hyb21lb3MtcmVsLzExNzY4L3VuaXRfdGVzdHMvVjJWaVVuUmpSWFpsYm5STWIyZE5ZVzVoWjJWeVZHVnpkQzVUZEdGeWRGSmxiVzkwWlV4dloyZHBibWRFYjJWelRtOTBVbVYwZFhKdVNXUlhhR1Z1Vlc1emRXTmpaWE56Wm5WcwwLEhNNYXN0ZXJGbGFrZUFuYWx5c2lzGAEM

Automatically posted by the findit-for-me app (https://goo.gl/Ot9f7N).

Many tests flaky, see:

https://findit-for-me.appspot.com/waterfall/flake/flake-culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vOTRhODcxMGRjZmViMjFhNDUxNjBjOTY4NmVkZWVjN2RlN2UzMjVjNAw

Going to dupe a lot of individual bugs against this.

 Issue 873257  has been merged into this issue.

 Issue 873254  has been merged into this issue.

 Issue 873253  has been merged into this issue.

 Issue 873252  has been merged into this issue.

 Issue 873250  has been merged into this issue.

 Issue 873249  has been merged into this issue.

 Issue 873247  has been merged into this issue.

 Issue 873246  has been merged into this issue.

 Issue 873245  has been merged into this issue.

 Issue 873244  has been merged into this issue.

 Issue 873242  has been merged into this issue.

 Issue 873241  has been merged into this issue.

 Issue 873240  has been merged into this issue.

 Issue 873238  has been merged into this issue.

 Issue 873237  has been merged into this issue.

 Issue 873235  has been merged into this issue.

 Issue 873231  has been merged into this issue.

 Issue 873259  has been merged into this issue.

All the tests seem to have gone green with the revert here.

For future reference, here's a sample crash from the findit runs:

[ RUN      ] WebRtcEventLogManagerTest.StartRemoteLoggingDoesNotReturnIdWhenUnsuccessful
Received signal 11 SEGV_MAPERR ffffffffffffed3e
#0 0x000004d53c7c base::debug::StackTrace::StackTrace()
#1 0x000004d537e1 base::debug::(anonymous namespace)::StackDumpSignalHandler()
#2 0x7f4a4e842330 <unknown>
#3 0x000004d2408a base::internal::TaskTracker::BeforePostTask()
#4 0x000004d23f5f base::internal::TaskTracker::WillPostTask()
#5 0x000004d70b36 base::internal::SchedulerWorkerPool::PostTaskWithSequence()
#6 0x000004d71047 base::internal::SchedulerSequencedTaskRunner::PostDelayedTask()
#7 0x0000045e6665 base::TestMockTimeTaskRunner::PostNonNestableDelayedTask()
#8 0x000004d02a6a base::SequencedTaskRunner::DeleteOrReleaseSoonInternal()
#9 0x000006694c41 feedback::AnonymizerToolContainer::~AnonymizerToolContainer()
#10 0x000003676b3b extensions::LogSourceAccessManager::~LogSourceAccessManager()
#11 0x00000367467d extensions::FeedbackPrivateAPI::~FeedbackPrivateAPI()
#12 0x0000062f5295 KeyedServiceFactory::Disassociate()
#13 0x0000062f5362 KeyedServiceFactory::ContextDestroyed()
#14 0x0000062f628c DependencyManager::DestroyContextServices()
#15 0x0000045dba00 TestingProfile::~TestingProfile()
#16 0x000000796f4e BrowsingDataRemoverTestingProfile::~BrowsingDataRemoverTestingProfile()
#17 0x000000e960b7 WebRtcEventLogManagerTestBase::~WebRtcEventLogManagerTestBase()
#18 0x000000e9535e WebRtcEventLogManagerTest_DisablingLocalLoggingWhenRemoteLoggingEnabledDoesNotStopWebRtcLogging_Test::~WebRtcEventLogManagerTest_DisablingLocalLoggingWhenRemoteLoggingEnabledDoesNotStopWebRtcLogging_Test()
#19 0x000002682b2d testing::TestInfo::Run()
#20 0x000002682fe7 testing::TestCase::Run()
#21 0x00000268e4e7 testing::internal::UnitTestImpl::RunAllTests()
#22 0x00000268e05d testing::UnitTest::Run()
#23 0x0000045e7d21 base::TestSuite::Run()
#24 0x0000045e971a base::(anonymous namespace)::LaunchUnitTestsInternal()
#25 0x0000045e95ca base::LaunchUnitTests()
#26 0x0000045df8a5 main
#27 0x7f4a4b492f45 __libc_start_main
#28 0x00000070046a _start
  r8: 0000000000000000  r9: 00000648abd409d0 r10: fffffffffffff801 r11: 0000000000000000
 r12: 0000000006694c90 r13: 00000648abd57900 r14: 00007ffd1f4ff160 r15: 00000648abdfe540
  di: ffffffffffffed2e  si: 0000000000000000  bp: 00007ffd1f4fedf0  bx: ffffffffffffed2e
  dx: 00007ffd1f4ff2a8  ax: 00000648abcee980  cx: 0000000000000000  sp: 00007ffd1f4fedd0
  ip: 0000000004d2408a efl: 0000000000010206 cgf: 0000000000000033 erf: 0000000000000005
 trp: 000000000000000e msk: 0000000000000000 cr2: ffffffffffffed3e
[end of stack trace]
Calling _exit(1). Core file will not be generated.
[1/1] WebRtcEventLogManagerTest.StartRemoteLoggingDoesNotReturnIdWhenUnsuccessful (CRASHED)
1 test crashed:
    WebRtcEventLogManagerTest.StartRemoteLoggingDoesNotReturnIdWhenUnsuccessful (../../chrome/browser/media/webrtc/webrtc_event_log_manager_unittest.cc:1957)