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 44e074f946bf875045362830714df607bc372f28..e9f2c43c6b913cc3ff154004ae173ed3c1de6a0d 100644
--- a/chrome/browser/chrome_browser_main_linux.h
+++ b/chrome/browser/chrome_browser_main_linux.h
@@ -17,10 +17,6 @@ class StorageMonitorLinux;
 }
 #endif
 
-namespace chrome {
-class MediaTransferProtocolDeviceObserverLinux;
-}
-
 class ChromeBrowserMainPartsLinux : public ChromeBrowserMainPartsPosix {
  public:
   explicit ChromeBrowserMainPartsLinux(
@@ -36,9 +32,6 @@ class ChromeBrowserMainPartsLinux : public ChromeBrowserMainPartsPosix {
 #if !defined(OS_CHROMEOS)
   scoped_refptr<chrome::StorageMonitorLinux> storage_monitor_;
 #endif
-  scoped_ptr<chrome::MediaTransferProtocolDeviceObserverLinux>
-      media_transfer_protocol_device_observer_;
-  bool initialized_media_transfer_protocol_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsLinux);
 };