Create an API around UtilityProcessHost and use that from chrome.

chrome/browser/image_decoder.h

 // Copyright (c) 2011 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_BROWSER_IMAGE_DECODER_H_
 #define CHROME_BROWSER_IMAGE_DECODER_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
-#include "content/browser/utility_process_host.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/utility_process_host_client.h"
 
 class SkBitmap;
 
 // Decodes an image in a sandboxed process.
-class ImageDecoder : public UtilityProcessHost::Client {
+class ImageDecoder : public content::UtilityProcessHostClient {
  public:
   class Delegate {
    public:
     // Called when image is decoded.
     // |decoder| is used to identify the image in case of decoding several
     // images simultaneously.
     virtual void OnImageDecoded(const ImageDecoder* decoder,
                                 const SkBitmap& decoded_image) = 0;
 
     // Called when decoding image failed. Delegate can do some cleanup in
     // this handler.
     virtual void OnDecodeImageFailed(const ImageDecoder* decoder) {}
 
    protected:
     virtual ~Delegate() {}
   };
 
   ImageDecoder(Delegate* delegate,
                const std::string& image_data);
 
   // Starts image decoding.
   void Start();
 
  private:
   // It's a reference counted object, so destructor is private.
   virtual ~ImageDecoder();
 
-  // Overidden from UtilityProcessHost::Client:
+  // Overidden from UtilityProcessHostClient:
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // IPC message handlers.
   void OnDecodeImageSucceeded(const SkBitmap& decoded_image);
   void OnDecodeImageFailed();
 
   // Launches sandboxed process that will decode the image.
   void DecodeImageInSandbox(const std::vector<unsigned char>& image_data);
 
   Delegate* delegate_;
   std::vector<unsigned char> image_data_;
   content::BrowserThread::ID target_thread_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageDecoder);
 };
 
 #endif  // CHROME_BROWSER_IMAGE_DECODER_H_