Roll FFMpeg for M26. Fix ffmpeg float audio decoding.

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 21de615b2d4fa0553a2229641cefd2f92106bde8..f6d329aa53006c6b5ec2c97e3a1c685960d62720 100644
--- a/media/filters/chunk_demuxer_unittest.cc
+++ b/media/filters/chunk_demuxer_unittest.cc
@@ -805,11 +805,12 @@ TEST_F(ChunkDemuxerTest, TestInit) {
 
       const AudioDecoderConfig& config = audio_stream->audio_decoder_config();
       EXPECT_EQ(kCodecVorbis, config.codec());
-      EXPECT_EQ(16, config.bits_per_channel());
+      EXPECT_EQ(32, config.bits_per_channel());
       EXPECT_EQ(CHANNEL_LAYOUT_STEREO, config.channel_layout());
       EXPECT_EQ(44100, config.samples_per_second());
       EXPECT_TRUE(config.extra_data());
       EXPECT_GT(config.extra_data_size(), 0u);
+      EXPECT_EQ(kSampleFormatPlanarF32, config.sample_format());
       EXPECT_EQ(is_audio_encrypted,
                 audio_stream->audio_decoder_config().is_encrypted());
     } else {