Remove TSan suppressions for issue 328804.

The corresponding races have been fixed long ago.

BUG=328804
TBR=yangguo@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/752603006

Cr-Original-Commit-Position: refs/heads/master@{#306092}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 7b3fe5e4a22a2243c7bb349b0603162c13040c71

sanitizers/tsan_suppressions.cc

@@ -169,10 +169,6 @@ char kTSanDefaultSuppressions[] =
 "race:PrepareTextureMailbox\n"
 "race:cc::LayerTreeHost::PaintLayerContents\n"
 
-// http://crbug.com/328804
-"race:v8::internal::Heap::SetStackLimits\n"
-"race:ScavengePointer\n"
-
 // http://crbug.com/328826
 "race:gLCDOrder\n"
 "race:gLCDOrientation\n"