Revert of Replace FFmpegDemuxer thread per element with base::TaskScheduler.

media/test/pipeline_integration_test.cc

Index: media/test/pipeline_integration_test.cc
diff --git a/media/test/pipeline_integration_test.cc b/media/test/pipeline_integration_test.cc
index da174a1dee05a2b26fdebd81bf4cc2f3e38d3bf8..15e6e868c7b064febfdec9a905eef971d17ace61 100644
--- a/media/test/pipeline_integration_test.cc
+++ b/media/test/pipeline_integration_test.cc
@@ -1723,12 +1723,16 @@
   EXPECT_HASH_EQ(config.hash, GetAudioHash());
 }
 
+// TODO(CHCUNNINGHAM): Re-enable for OSX once 1% flakiness is root caused.
+// See http://crbug.com/571898
+#if !defined(OS_MACOSX)
 // CBR seeks should always be fast and accurate.
 INSTANTIATE_TEST_CASE_P(
     CBRSeek_HasTOC,
     Mp3FastSeekIntegrationTest,
     ::testing::Values(Mp3FastSeekParams("bear-audio-10s-CBR-has-TOC.mp3",
-                                        "-0.71,0.36,2.96,2.68,2.11,-1.08,")));
+                                        "-0.71,0.36,2.96,2.68,2.10,-1.08,")));
+#endif
 
 INSTANTIATE_TEST_CASE_P(
     CBRSeeks_NoTOC,