Re-enable tests that failed under Linux_Msan.

webrtc/video/video_send_stream_tests.cc

Index: webrtc/video/video_send_stream_tests.cc
diff --git a/webrtc/video/video_send_stream_tests.cc b/webrtc/video/video_send_stream_tests.cc
index efdee1906fd24d6c2966303fceae32d461f86163..4cf92748a8d3225755a9d7c09119d845cd076aed 100644
--- a/webrtc/video/video_send_stream_tests.cc
+++ b/webrtc/video/video_send_stream_tests.cc
@@ -2146,9 +2146,6 @@ TEST_F(VideoSendStreamTest, Vp9NonFlexMode_1Tl2SLayers) {
   TestVp9NonFlexMode(kNumTemporalLayers, kNumSpatialLayers);
 }
 
-#if !defined(MEMORY_SANITIZER)
-// Fails under MemorySanitizer:
-// See https://code.google.com/p/webrtc/issues/detail?id=5402.
 TEST_F(VideoSendStreamTest, Vp9NonFlexMode_2Tl2SLayers) {
   const uint8_t kNumTemporalLayers = 2;
   const uint8_t kNumSpatialLayers = 2;
@@ -2160,7 +2157,6 @@ TEST_F(VideoSendStreamTest, Vp9NonFlexMode_3Tl2SLayers) {
   const uint8_t kNumSpatialLayers = 2;
   TestVp9NonFlexMode(kNumTemporalLayers, kNumSpatialLayers);
 }
-#endif
 
 void VideoSendStreamTest::TestVp9NonFlexMode(uint8_t num_temporal_layers,
                                              uint8_t num_spatial_layers) {