ChromeOS: Implement MediaTransferProtocolManager observer.

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
diff --git a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
index 4c0aa7c371885e13ca68bc2d1c9f6fc995a282cd..11ffbeacadc57617e95a5d720ac0a889d05e1fb0 100644
--- a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
+++ b/chrome/browser/chromeos/chrome_browser_main_chromeos.cc
@@ -36,6 +36,7 @@
 #include "chrome/browser/chromeos/login/wallpaper_manager.h"
 #include "chrome/browser/chromeos/login/wizard_controller.h"
 #include "chrome/browser/chromeos/low_memory_observer.h"
+#include "chrome/browser/chromeos/mtp/media_transfer_protocol_device_observer.h"
 #include "chrome/browser/chromeos/net/cros_network_change_notifier_factory.h"
 #include "chrome/browser/chromeos/net/network_change_notifier_chromeos.h"
 #include "chrome/browser/chromeos/oom_priority_manager.h"
@@ -444,6 +445,8 @@ void ChromeBrowserMainPartsChromeos::PostProfileInit() {
   // Initialize the brightness observer so that we'll display an onscreen
   // indication of brightness changes during login.
   brightness_observer_.reset(new chromeos::BrightnessObserver());
+  media_transfer_protocol_device_observer_.reset(
+      new chromeos::mtp::MediaTransferProtocolDeviceObserver());
   output_observer_.reset(new chromeos::OutputObserver());
   resume_observer_.reset(new chromeos::ResumeObserver());
   screen_lock_observer_.reset(new chromeos::ScreenLockObserver());
@@ -523,6 +526,7 @@ void ChromeBrowserMainPartsChromeos::PostMainMessageLoopRun() {
   screen_lock_observer_.reset();
   resume_observer_.reset();
   brightness_observer_.reset();
+  media_transfer_protocol_device_observer_.reset();
   output_observer_.reset();
 
   // The XInput2 event listener needs to be shut down earlier than when