Remove obsolete tsan suppressions

Refactoring CL has now landed:
https://webrtc-review.googlesource.com/c/src/+/61781

We can remove tsan suppressions for class names that no longer exist.

Bug: webrtc:9012
Change-Id: Idbc4b7fe980811ec0d11e805d6e0def08ec98233
Reviewed-on: https://chromium-review.googlesource.com/964261Reviewed-by: Alexander Potapenko <glider@chromium.org>
Commit-Queue: Alexander Potapenko <glider@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543359}

build/sanitizers/tsan_suppressions.cc

@@ -80,9 +80,6 @@ char kTSanDefaultSuppressions[] =
     "race:webrtc::RTPSender::SendOutgoingData\n"
     "race:webrtc::LibvpxVp8Encoder::GetEncodedPartitions\n"
     "race:webrtc::LibvpxVp8Encoder::Encode\n"
-    // TODO(sprang): Remove VP8EncoderImpl suppressions after fixing webrtc:9012
-    "race:webrtc::VP8EncoderImpl::GetEncodedPartitions\n"
-    "race:webrtc::VP8EncoderImpl::Encode\n"
     "race:webrtc::ViEEncoder::DeliverFrame\n"
     "race:webrtc::vcm::VideoReceiver::Decode\n"
     "race:webrtc::VCMReceiver::FrameForDecoding\n"