Split printing utility IPC messages into its own file.

chrome/utility/image_writer/image_writer_handler.h

 // Copyright 2014 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 CHROME_UTILITY_IMAGE_WRITER_IMAGE_WRITER_HANDLER_H_
 #define CHROME_UTILITY_IMAGE_WRITER_IMAGE_WRITER_HANDLER_H_
 
 #include <string>
 
 #include "chrome/utility/image_writer/image_writer.h"
 #include "chrome/utility/utility_message_handler.h"
 #include "ipc/ipc_message.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace image_writer {
 
 // A handler for messages related to writing images.  This class is added as a
-// handler in chrome::ChromeContentUtilityClient.
-class ImageWriterHandler : public chrome::UtilityMessageHandler {
+// handler in ChromeContentUtilityClient.
+class ImageWriterHandler : public UtilityMessageHandler {
  public:
   ImageWriterHandler();
   virtual ~ImageWriterHandler();
 
   // Methods for sending the different messages back to the browser process.
   // Generally should be called by chrome::image_writer::ImageWriter.
   virtual void SendSucceeded();
   virtual void SendCancelled();
   virtual void SendFailed(const std::string& message);
   virtual void SendProgress(int64 progress);
 
  private:
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // Small wrapper for sending on the UtilityProcess.
   void Send(IPC::Message* msg);
 
   // Message handlers.
   void OnWriteStart(const base::FilePath& image, const base::FilePath& device);
   void OnVerifyStart(const base::FilePath& image, const base::FilePath& device);
   void OnCancel();
 
   scoped_ptr<ImageWriter> image_writer_;
 };
 
 }  // namespace image_writer
 
 #endif  // CHROME_UTILITY_IMAGE_WRITER_IMAGE_WRITER_HANDLER_H_