Running ToT locally on Linux, the Widevine browser_tests are failing.

[253711:253711:0301/112556.771118:INFO:test_license_server.cc(51)] Killing license server.
[253711:253711:0301/112556.771180:FATAL:thread_restrictions.cc(105)] Check failed: !g_base_sync_primitives_disallowed.Get().Get(). Waiting on a //base sync primitive is not allowed on this thread to prevent jank and deadlock. If waiting on a //base sync primitive is unavoidable, do it within the scope of a ScopedAllowBaseSyncPrimitives. If in a test, use ScopedAllowBaseSyncPrimitivesForTesting.
#0 0x7fe18ece56ad base::debug::StackTrace::StackTrace()
#1 0x7fe18ece3b9c base::debug::StackTrace::StackTrace()
#2 0x7fe18ed6bbca logging::LogMessage::~LogMessage()
#3 0x7fe18ef0abdb base::internal::AssertBaseSyncPrimitivesAllowed()
#4 0x7fe18ee35385 base::Process::WaitForExitWithTimeout()
#5 0x7fe18ee351da base::Process::Terminate()
#6 0x00000220cf0a TestLicenseServer::Stop()
#7 0x00000220cd3c TestLicenseServer::~TestLicenseServer()
#8 0x0000021be5b1 EncryptedMediaTestBase::~EncryptedMediaTestBase()
#9 0x0000021be461 EncryptedMediaTest::~EncryptedMediaTest()
#10 0x0000021baca5 EncryptedMediaTest_PolicyCheck_Test::~EncryptedMediaTest_PolicyCheck_Test()