Regularize ownerships and lifecycle for storage monitor platform classes.

chrome/browser/chrome_browser_main_linux.h

Index: chrome/browser/chrome_browser_main_linux.h
diff --git a/chrome/browser/chrome_browser_main_linux.h b/chrome/browser/chrome_browser_main_linux.h
index e76f34882868db1042a43d2f426c5125db18e8b8..531026fb778274393c48dc4608550624a5dbe6a4 100644
--- a/chrome/browser/chrome_browser_main_linux.h
+++ b/chrome/browser/chrome_browser_main_linux.h
@@ -17,10 +17,6 @@ class RemovableDeviceNotificationsLinux;
 }
 #endif
 
-namespace chrome {
-class MediaTransferProtocolDeviceObserverLinux;
-}
-
 class ChromeBrowserMainPartsLinux : public ChromeBrowserMainPartsPosix {
  public:
   explicit ChromeBrowserMainPartsLinux(
@@ -37,9 +33,6 @@ class ChromeBrowserMainPartsLinux : public ChromeBrowserMainPartsPosix {
   scoped_refptr<chrome::RemovableDeviceNotificationsLinux>
       removable_device_notifications_linux_;
 #endif
-  scoped_ptr<chrome::MediaTransferProtocolDeviceObserverLinux>
-      media_transfer_protocol_device_observer_;
-  bool initialized_media_transfer_protocol_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsLinux);
 };