Update the TSan v2 suppressions for issue 46840:

tools/valgrind/tsan_v2/suppressions.txt

 # False positives in libflashplayer.so and libglib.so. Since we don't
 # instrument them, we cannot reason about the synchronization in them.
 race:libflashplayer.so
 race:libglib*.so
 
 # Intentional race in ToolsSanityTest.DataRace in base_unittests.
 race:base/tools_sanity_unittest.cc
 
 # Data race on WatchdogCounter [test-only]
 race:base/threading/watchdog_unittest.cc
 
 # Races in libevent, http://crbug.com/23244
 race:libevent/event.c
 
 # http://crbug.com/46840
-race:history::HistoryBackend::DeleteFTSIndexDatabases
-race:history::InMemoryHistoryBackend::Init
+race:base::HistogramSamples::IncreaseSum
 
 # http://crbug.com/84094
 race:sqlite3StatusSet
 race:pcache1EnforceMaxPage
 race:pcache1AllocPage
 
 # http://crbug.com/102327.
 # Test-only race, won't fix.
 race:tracked_objects::ThreadData::ShutdownSingleThreadedCleanup
 
@@ skipping 28 matching lines @@
 # http://crbug.com/223352
 race:uprv_malloc_46
 race:uprv_realloc_46
 
 # http://crbug.com/223955
 race:PassRefPtr
 
 # http://crbug.com/224617
 race:base::debug::TraceEventTestFixture_TraceSampling_Test::TestBody
 
+# http://crbug.com/239359
+race:media::TestInputCallback::OnData
+
 # http://crbug.com/244368
 race:skia::BeginPlatformPaint
 
 # http://crbug.com/244385
 race:unixTempFileDir
 
 # http://crbug.com/244774
 race:webrtc::RTPReceiver::ProcessBitrate
 race:webrtc::RTPSender::ProcessBitrate
 race:webrtc::VideoCodingModuleImpl::Decode
@@ skipping 32 matching lines @@
 race:gLibCleanupFunctions
 
 # http://crbug.com/270675
 race:net::RuleBasedHostResolverProc::Resolve
 
 # http://crbug.com/272095
 race:base::g_top_manager
 
 # http://crbug.com/273047
 race:base::*::g_lazy_tls_ptr