Remove usage of ScopedTaskScheduler.

media/filters/ffmpeg_demuxer_unittest.cc

Index: media/filters/ffmpeg_demuxer_unittest.cc
diff --git a/media/filters/ffmpeg_demuxer_unittest.cc b/media/filters/ffmpeg_demuxer_unittest.cc
index 5e9bc043a312b2e455396e9cbec1913f97306030..5ff72b20e48a1b9a6d57632694179b4d030743e0 100644
--- a/media/filters/ffmpeg_demuxer_unittest.cc
+++ b/media/filters/ffmpeg_demuxer_unittest.cc
@@ -18,7 +18,7 @@
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/test/mock_callback.h"
-#include "base/test/scoped_task_scheduler.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "media/base/decrypt_config.h"
@@ -279,7 +279,7 @@ class FFmpegDemuxerTest : public testing::Test {
 
   // Fixture members.
 
-  base::test::ScopedTaskScheduler task_scheduler_;
+  base::test::ScopedTaskEnvironment scoped_task_environment_;
   MediaLog media_log_;
   std::unique_ptr<FileDataSource> data_source_;
   std::unique_ptr<FFmpegDemuxer> demuxer_;