Remove usage of ScopedTaskScheduler.

media/base/demuxer_perftest.cc

Index: media/base/demuxer_perftest.cc
diff --git a/media/base/demuxer_perftest.cc b/media/base/demuxer_perftest.cc
index 4bfbaef61ecf8928e1d5e512e77f77991d1f7d78..83cd977c648ec9f9a9b2cc6e6061b1142071926a 100644
--- a/media/base/demuxer_perftest.cc
+++ b/media/base/demuxer_perftest.cc
@@ -9,10 +9,9 @@
 #include "base/at_exit.h"
 #include "base/bind.h"
 #include "base/macros.h"
-#include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/strings/string_number_conversions.h"
-#include "base/test/scoped_task_scheduler.h"
+#include "base/test/scoped_task_environment.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
@@ -181,7 +180,7 @@ static void RunDemuxerBenchmark(const std::string& filename) {
   MediaLog media_log_;
   for (int i = 0; i < kBenchmarkIterations; ++i) {
     // Setup.
-    base::test::ScopedTaskScheduler scoped_task_scheduler;
+    base::test::ScopedTaskEnvironment scoped_task_environment_;
     DemuxerHostImpl demuxer_host;
     FileDataSource data_source;
     ASSERT_TRUE(data_source.Initialize(file_path));