Add support for cancellation of demuxer reads.

media/base/pipeline_impl_unittest.cc

Index: media/base/pipeline_impl_unittest.cc
diff --git a/media/base/pipeline_impl_unittest.cc b/media/base/pipeline_impl_unittest.cc
index f0f2e8d0f1b3e94bc1756e7ff639f8201f1d12f6..524b3d5fceb4a31e5c0d46a22b27f53fc59a0e1a 100644
--- a/media/base/pipeline_impl_unittest.cc
+++ b/media/base/pipeline_impl_unittest.cc
@@ -257,11 +257,6 @@ class PipelineImplTest : public ::testing::Test {
 
   void ExpectSuspend() {
     EXPECT_CALL(*renderer_, SetPlaybackRate(0));
-    EXPECT_CALL(*renderer_, Flush(_))
-        .WillOnce(
-            DoAll(SetBufferingState(&renderer_client_, BUFFERING_HAVE_NOTHING),
-                  RunClosure<0>()));
-    EXPECT_CALL(callbacks_, OnBufferingStateChange(BUFFERING_HAVE_NOTHING));
     EXPECT_CALL(callbacks_, OnSuspend(PIPELINE_OK));
   }
 
@@ -1002,12 +997,7 @@ class PipelineTeardownTest : public PipelineImplTest {
 
   void SetSuspendExpectations(TeardownState state, StopOrError stop_or_error) {
     EXPECT_CALL(*renderer_, SetPlaybackRate(0));
-    EXPECT_CALL(callbacks_, OnBufferingStateChange(BUFFERING_HAVE_NOTHING));
     EXPECT_CALL(callbacks_, OnSuspend(PIPELINE_OK));
-    EXPECT_CALL(*renderer_, Flush(_))
-        .WillOnce(
-            DoAll(SetBufferingState(&renderer_client_, BUFFERING_HAVE_NOTHING),
-                  RunClosure<0>()));
     if (state == kResuming) {
       if (stop_or_error == kStop) {
         EXPECT_CALL(*demuxer_, Seek(_, _))