Add a new GetInstance() method for remaining files with singleton classes under chrome/browser.

chrome/browser/dom_ui/mediaplayer_ui.h

Index: chrome/browser/dom_ui/mediaplayer_ui.h
diff --git a/chrome/browser/dom_ui/mediaplayer_ui.h b/chrome/browser/dom_ui/mediaplayer_ui.h
index 8a34d7c7f442b55f9e8ad42169603b37b3103d30..ccb3fb137d72ca716454bd5866d5a0df9aeb34cd 100644
--- a/chrome/browser/dom_ui/mediaplayer_ui.h
+++ b/chrome/browser/dom_ui/mediaplayer_ui.h
@@ -89,9 +89,7 @@ class MediaPlayer : public NotificationObserver,
                const NotificationDetails& details);
 
   // Getter for the singleton.
-  static MediaPlayer* Get() {
-    return Singleton<MediaPlayer>::get();
-  }
+  static MediaPlayer* Get();
 
  private:
   MediaPlayer();