Intiialize AudioManager and related class lazily

content/browser/browser_main_loop.h

Index: content/browser/browser_main_loop.h
diff --git a/content/browser/browser_main_loop.h b/content/browser/browser_main_loop.h
index f970dc6aabbe40a4867c48fc6460dfd108b0a9f9..97f7cac042cc759f55a7680677f16f815a0975ac 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -122,10 +122,10 @@ class CONTENT_EXPORT BrowserMainLoop {
 
   int GetResultCode() const { return result_code_; }
 
-  media::AudioManager* audio_manager() const { return audio_manager_.get(); }
-  MediaStreamManager* media_stream_manager() const {
-    return media_stream_manager_.get();
-  }
+  media::AudioManager* GetAudioManager();
+  MediaStreamManager* GetMediaStreamManager();
+  void InitializeSpeechRecognitionManager();
+
   media::UserInputMonitor* user_input_monitor() const {
     return user_input_monitor_.get();
   }
@@ -171,7 +171,6 @@ class CONTENT_EXPORT BrowserMainLoop {
   void InitStartupTracingForDuration(const base::CommandLine& command_line);
   void EndStartupTracing();
 
-  void CreateAudioManager();
   bool UsingInProcessGpu() const;
 
   // Quick reference for initialization order: