Re-land 16025005 with fix for statics perf issue

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 0317e030bf7e50e47f4415d5ef85cae818556d48..fc412ccc48d1cb1eda1230998224098513d78747 100644
--- a/content/browser/browser_main_loop.h
+++ b/content/browser/browser_main_loop.h
@@ -20,6 +20,7 @@ class SystemMonitor;
 
 namespace media {
 class AudioManager;
+class MIDIManager;
 }
 
 namespace net {
@@ -81,6 +82,7 @@ class BrowserMainLoop {
   MediaStreamManager* media_stream_manager() const {
     return media_stream_manager_.get();
   }
+  media::MIDIManager* midi_manager() const { return midi_manager_.get(); }
 
  private:
   class MemoryObserver;
@@ -106,6 +108,7 @@ class BrowserMainLoop {
   scoped_ptr<HighResolutionTimerManager> hi_res_timer_manager_;
   scoped_ptr<net::NetworkChangeNotifier> network_change_notifier_;
   scoped_ptr<media::AudioManager> audio_manager_;
+  scoped_ptr<media::MIDIManager> midi_manager_;
   scoped_ptr<AudioMirroringManager> audio_mirroring_manager_;
   scoped_ptr<MediaStreamManager> media_stream_manager_;
   // Per-process listener for online state changes.