Remove calls to deprecated MessageLoop methods in media.

media/audio/audio_output_proxy_unittest.cc

Index: media/audio/audio_output_proxy_unittest.cc
diff --git a/media/audio/audio_output_proxy_unittest.cc b/media/audio/audio_output_proxy_unittest.cc
index 44af384c4b400ddbd2d25cae36ac6a7f1ad6d2f6..d999d3c5ee108983db6b650f51653b297eb65db3 100644
--- a/media/audio/audio_output_proxy_unittest.cc
+++ b/media/audio/audio_output_proxy_unittest.cc
@@ -9,6 +9,7 @@
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "media/audio/audio_manager.h"
@@ -167,7 +168,7 @@ class AudioOutputProxyTest : public testing::Test {
   void TearDown() override {
     // This is necessary to free all proxy objects that have been
     // closed by the test.
-    message_loop_.RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
   }
 
   virtual void InitDispatcher(base::TimeDelta close_delay) {
@@ -443,9 +444,8 @@ class AudioOutputResamplerTest : public AudioOutputProxyTest {
   void OnStart() override {
     // Let Start() run for a bit.
     base::RunLoop run_loop;
-    message_loop_.PostDelayedTask(
-        FROM_HERE,
-        run_loop.QuitClosure(),
+    message_loop_.task_runner()->PostDelayedTask(
+        FROM_HERE, run_loop.QuitClosure(),
         base::TimeDelta::FromMilliseconds(kStartRunTimeMs));
     run_loop.Run();
   }
@@ -725,7 +725,7 @@ TEST_F(AudioOutputResamplerTest, FallbackRecovery) {
   // Once all proxies have been closed, AudioOutputResampler will start the
   // reinitialization timer and execute it after the close delay elapses.
   base::RunLoop run_loop;
-  message_loop_.PostDelayedTask(
+  message_loop_.task_runner()->PostDelayedTask(
       FROM_HERE, run_loop.QuitClosure(),
       base::TimeDelta::FromMilliseconds(2 * kTestCloseDelayMs));
   run_loop.Run();