Add support for config changes during playback to FFmpegVideoDecoder.

media/filters/chunk_demuxer_unittest.cc

Index: media/filters/chunk_demuxer_unittest.cc
diff --git a/media/filters/chunk_demuxer_unittest.cc b/media/filters/chunk_demuxer_unittest.cc
index d4f1a807f4394de9107ff3bba62d7a9337d859ad..d8338764b7bc96c2bead68532b4229442f8eb551 100644
--- a/media/filters/chunk_demuxer_unittest.cc
+++ b/media/filters/chunk_demuxer_unittest.cc
@@ -2056,10 +2056,6 @@ TEST_F(ChunkDemuxerTest, TestConfigChange_Video) {
   ASSERT_EQ(status, DemuxerStream::kConfigChanged);
   EXPECT_EQ(last_timestamp.InMilliseconds(), 467);
 
-  // Verify that another read will result in kConfigChanged being returned
-  // again.
-  ExpectConfigChanged(stream);
-
   // Fetch the new decoder config.
   const VideoDecoderConfig& video_config_2 = stream->video_decoder_config();
   ASSERT_TRUE(video_config_2.IsValidConfig());
@@ -2073,9 +2069,6 @@ TEST_F(ChunkDemuxerTest, TestConfigChange_Video) {
   ASSERT_EQ(status, DemuxerStream::kConfigChanged);
   EXPECT_EQ(last_timestamp.InMilliseconds(), 767);
 
-  // Verify we get another ConfigChanged status.
-  ExpectConfigChanged(stream);
-
   // Get the new config and verify that it matches the first one.
   ASSERT_TRUE(video_config_1.Matches(stream->video_decoder_config()));
 
@@ -2110,10 +2103,6 @@ TEST_F(ChunkDemuxerTest, TestConfigChange_Audio) {
   ASSERT_EQ(status, DemuxerStream::kConfigChanged);
   EXPECT_EQ(last_timestamp.InMilliseconds(), 464);
 
-  // Verify that another read will result in kConfigChanged being returned
-  // again.
-  ExpectConfigChanged(stream);
-
   // Fetch the new decoder config.
   const AudioDecoderConfig& audio_config_2 = stream->audio_decoder_config();
   ASSERT_TRUE(audio_config_2.IsValidConfig());
@@ -2127,9 +2116,6 @@ TEST_F(ChunkDemuxerTest, TestConfigChange_Audio) {
   ASSERT_EQ(status, DemuxerStream::kConfigChanged);
   EXPECT_EQ(last_timestamp.InMilliseconds(), 756);
 
-  // Verify we get another ConfigChanged status.
-  ExpectConfigChanged(stream);
-
   // Get the new config and verify that it matches the first one.
   ASSERT_TRUE(audio_config_1.Matches(stream->audio_decoder_config()));