Remove VideoRenderer::Pause() as it serves no real purpose.

media/base/pipeline_unittest.cc

Index: media/base/pipeline_unittest.cc
diff --git a/media/base/pipeline_unittest.cc b/media/base/pipeline_unittest.cc
index 2c559c10819233a2eef519387a3b2950001f3f6e..d2a7a8f3df59ebd0d2f8447647aa0bdaecb99c34 100644
--- a/media/base/pipeline_unittest.cc
+++ b/media/base/pipeline_unittest.cc
@@ -269,8 +269,6 @@ class PipelineTest : public ::testing::Test {
     }
 
     if (video_stream_) {
-      EXPECT_CALL(*video_renderer_, Pause(_))
-          .WillOnce(RunClosure<0>());
       EXPECT_CALL(*video_renderer_, Flush(_))
           .WillOnce(RunClosure<0>());
       EXPECT_CALL(*video_renderer_, Preroll(seek_time, _))
@@ -1051,7 +1049,6 @@ class PipelineTeardownTest : public PipelineTest {
     }
 
     EXPECT_CALL(*audio_renderer_, Pause());
-    EXPECT_CALL(*video_renderer_, Pause(_)).WillOnce(RunClosure<0>());
 
     if (state == kFlushing) {
       if (stop_or_error == kStop) {