Remove 'content' dependency from device/media_transfer_protocol

device/media_transfer_protocol/media_transfer_protocol_manager.h

Index: device/media_transfer_protocol/media_transfer_protocol_manager.h
diff --git a/device/media_transfer_protocol/media_transfer_protocol_manager.h b/device/media_transfer_protocol/media_transfer_protocol_manager.h
index 5c416b5f6689d1039f65463865c547fe3dc7f991..45fa0fa831acbb292cb36c4c5e82d6c89395a7b9 100644
--- a/device/media_transfer_protocol/media_transfer_protocol_manager.h
+++ b/device/media_transfer_protocol/media_transfer_protocol_manager.h
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/callback.h"
+#include "base/memory/ref_counted.h"
 #include "build/build_config.h"
 
 #if !defined(OS_LINUX)
@@ -18,6 +19,10 @@
 class MtpFileEntry;
 class MtpStorageInfo;
 
+namespace base {
+class MessageLoopProxy;
+}
+
 namespace device {
 
 // This class handles the interaction with mtpd.
@@ -128,7 +133,10 @@ class MediaTransferProtocolManager {
                                const GetFileInfoCallback& callback) = 0;
 
   // Creates the global MediaTransferProtocolManager instance.
-  static void Initialize();
+  // On Linux, |loop_proxy| specifies the Bus object message loop proxy

[Lei Zhang, 2013/01/31 20:56:38]

Someone reading the header won't know what Bus object you are talking about.
Just omit that bit.

[kmadhusu, 2013/01/31 22:07:59]

Done.

+  // to process asynchronous operations.
+  // On ChromeOS, |loop_proxy| is set to NULL.

[Lei Zhang, 2013/01/31 20:56:38]

... set to NULL because ChromeOS already has a dedicated message loop proxy.

[kmadhusu, 2013/01/31 22:07:59]

Done.

+  static void Initialize(scoped_refptr<base::MessageLoopProxy> loop_proxy);
 
   // Destroys the global MediaTransferProtocolManager instance if it exists.
   static void Shutdown();