Remove some media-related tsan suppressions that are no longer valid.

tools/valgrind/tsan/suppressions.txt

Index: tools/valgrind/tsan/suppressions.txt
diff --git a/tools/valgrind/tsan/suppressions.txt b/tools/valgrind/tsan/suppressions.txt
index 34d4813b61f1fa90107f1d255daea03637381c81..07989b82a10bcc96e66e2a64acaf530738eaf987 100644
--- a/tools/valgrind/tsan/suppressions.txt
+++ b/tools/valgrind/tsan/suppressions.txt
@@ -432,18 +432,6 @@
 }
 
 {
-  bug_46642a
-  ThreadSanitizer:Race
-  fun:*media*Pipeline*InitializeTask*
-}
-
-{
-  bug_46642b
-  ThreadSanitizer:Race
-  fun:*media*Pipeline*GetCurrentTime*
-}
-
-{
   bug_57266a
   ThreadSanitizer:Race
   ...
@@ -758,26 +746,6 @@
   fun:DispatchToMethod
 }
 {
-  bug_107181a
-  ThreadSanitizer:Race
-  ...
-  fun:media::AudioRendererBase::SetPlaybackRate
-  fun:AudioRendererImpl::SetPlaybackRate
-  fun:media::CompositeFilter::SetPlaybackRate
-  fun:media::Pipeline::PlaybackRateChangedTask
-  ...
-  fun:base::internal::RunnableAdapter::Run
-}
-{
-  bug_107181b
-  ThreadSanitizer:Race
-  fun:media::AudioRendererAlgorithmBase::playback_rate
-  fun:media::AudioRendererBase::GetPlaybackRate
-  fun:AudioRendererImpl::Render
-  fun:AudioDevice::FireRenderCallback
-  fun:AudioDevice::Run
-}
-{
    bug_107903_a
    ThreadSanitizer:Race
    ...