Remove 'content' dependency from device/media_transfer_protocol

device/media_transfer_protocol/media_transfer_protocol_manager.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef DEVICE_MEDIA_TRANSFER_PROTOCOL_MEDIA_TRANSFER_PROTOCOL_MANAGER_H_
 #define DEVICE_MEDIA_TRANSFER_PROTOCOL_MEDIA_TRANSFER_PROTOCOL_MANAGER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/callback.h"
+#include "base/memory/ref_counted.h"
 #include "build/build_config.h"
 
 #if !defined(OS_LINUX)
 #error "Only used on Linux and ChromeOS"
 #endif
 
 class MtpFileEntry;
 class MtpStorageInfo;
 
+namespace base {
+class MessageLoopProxy;
+}
+
 namespace device {
 
 // This class handles the interaction with mtpd.
 // Other classes can add themselves as observers.
 class MediaTransferProtocolManager {
  public:
   // A callback to handle the result of OpenStorage.
   // The first argument is the returned handle.
   // The second argument is true if there was an error.
   typedef base::Callback<void(const std::string& handle,
@@ skipping 90 matching lines @@
                                  const std::string& path,
                                  const GetFileInfoCallback& callback) = 0;
 
   // Gets the file metadata for |file_id| on |storage_handle| and runs
   // |callback|.
   virtual void GetFileInfoById(const std::string& storage_handle,
                                uint32 file_id,
                                const GetFileInfoCallback& callback) = 0;
 
   // Creates the global MediaTransferProtocolManager instance.
-  static void Initialize();
+  // On Linux, |loop_proxy| specifies the message loop proxy to process
+  // asynchronous operations.
+  // On ChromeOS, |loop_proxy| is set to NULL because ChromeOS already has a
+  // dedicated message loop proxy.
+  static void Initialize(scoped_refptr<base::MessageLoopProxy> loop_proxy);
 
   // Destroys the global MediaTransferProtocolManager instance if it exists.
   static void Shutdown();
 
   // Returns a pointer to the global MediaTransferProtocolManager instance.
   // Initialize() should already have been called.
   static MediaTransferProtocolManager* GetInstance();
 };
 
 }  // namespace device
 
 #endif  // DEVICE_MEDIA_TRANSFER_PROTOCOL_MEDIA_TRANSFER_PROTOCOL_MANAGER_H_