Remove all remaining traces of MessageLoopProxy.

content/browser/speech/speech_recognition_browsertest.cc

Index: content/browser/speech/speech_recognition_browsertest.cc
diff --git a/content/browser/speech/speech_recognition_browsertest.cc b/content/browser/speech/speech_recognition_browsertest.cc
index d2c3d585fde3c88682ccd55b0fb15096b2a3fa35..ac6bcbc251621c624dfa0520c4d194c3d5809bef 100644
--- a/content/browser/speech/speech_recognition_browsertest.cc
+++ b/content/browser/speech/speech_recognition_browsertest.cc
@@ -121,10 +121,9 @@ class SpeechRecognitionBrowserTest :
   void SetUpOnMainThread() override {
     ASSERT_TRUE(SpeechRecognitionManagerImpl::GetInstance());
     media::AudioManager::StartHangMonitorIfNeeded(
-        BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO));
-    SpeechRecognizerImpl::SetAudioManagerForTesting(
-        new media::MockAudioManager(BrowserThread::GetMessageLoopProxyForThread(
-            BrowserThread::IO)));
+        BrowserThread::GetTaskRunnerForThread(BrowserThread::IO));
+    SpeechRecognizerImpl::SetAudioManagerForTesting(new media::MockAudioManager(
+        BrowserThread::GetTaskRunnerForThread(BrowserThread::IO)));
   }
 
   void TearDownOnMainThread() override {