ChromeOS: Implement MediaTransferProtocolManager observer.

chrome/browser/chromeos/chrome_browser_main_chromeos.h

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.h
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.h b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
index c4df57e4c8d2e66893e814f9b9b45397d5ffe33b..016a29971389cf4a25459da9a89d7c5f664658e7 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.h
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.h
@@ -21,6 +21,11 @@ class ScreenLockObserver;
 class SessionManagerObserver;
 class UserActivityNotifier;
 class VideoActivityNotifier;
+
+namespace mtp {
+class MediaTransferProtocolDeviceObserver;
+}  // namespace mtp
+
 }  // namespace chromeos
 
 namespace contacts {
@@ -59,6 +64,8 @@ class ChromeBrowserMainPartsChromeos : public ChromeBrowserMainPartsLinux {
 
   scoped_ptr<contacts::ContactManager> contact_manager_;
   scoped_ptr<chromeos::BrightnessObserver> brightness_observer_;
+  scoped_ptr<chromeos::mtp::MediaTransferProtocolDeviceObserver>
+      media_transfer_protocol_device_observer_;
   scoped_ptr<chromeos::OutputObserver> output_observer_;
   scoped_ptr<chromeos::ResumeObserver> resume_observer_;
   scoped_ptr<chromeos::ScreenLockObserver> screen_lock_observer_;