Create an API around UtilityProcessHost and use that from chrome.

chrome/browser/extensions/webstore_install_helper.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 CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALL_HELPER_H_
 #define CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALL_HELPER_H_
 #pragma once
 
-#include "content/browser/utility_process_host.h"
+#include <vector>
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "content/public/browser/utility_process_host_client.h"
 #include "content/public/common/url_fetcher_delegate.h"
 #include "googleurl/src/gurl.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
-class UtilityProcessHost;
 class SkBitmap;
 
 namespace base {
 class DictionaryValue;
 class ListValue;
 }
 
+namespace content {
+class UtilityProcessHost;
+}
+
 namespace net {
 class URLRequestContextGetter;
 }
 
 // This is a class to help dealing with webstore-provided data. It manages
 // sending work to the utility process for parsing manifests and
 // fetching/decoding icon data. Clients must implement the
 // WebstoreInstallHelper::Delegate interface to receive the parsed data.
-class WebstoreInstallHelper : public UtilityProcessHost::Client,
+class WebstoreInstallHelper : public content::UtilityProcessHostClient,
                               public content::URLFetcherDelegate {
  public:
   class Delegate {
    public:
     enum InstallHelperResultCode {
       UNKNOWN_ERROR,
       ICON_ERROR,
       MANIFEST_ERROR
     };
 
@@ skipping 26 matching lines @@
   virtual ~WebstoreInstallHelper();
 
   void StartWorkOnIOThread();
   void StartFetchedImageDecode();
   void ReportResultsIfComplete();
   void ReportResultFromUIThread();
 
   // Implementing the content::URLFetcherDelegate interface.
   virtual void OnURLFetchComplete(const content::URLFetcher* source) OVERRIDE;
 
-  // Implementing pieces of the UtilityProcessHost::Client interface.
+  // Implementing pieces of the UtilityProcessHostClient interface.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
 
   // Message handlers.
   void OnDecodeImageSucceeded(const SkBitmap& decoded_image);
   void OnDecodeImageFailed();
   void OnJSONParseSucceeded(const base::ListValue& wrapper);
   void OnJSONParseFailed(const std::string& error_message);
 
   // The client who we'll report results back to.
   Delegate* delegate_;
 
   // The extension id of the manifest we're parsing.
   std::string id_;
 
   // The manifest to parse.
   std::string manifest_;
 
   // Only one of these should be non-empty. If |icon_base64_data_| is non-emtpy,
   // it's a base64-encoded string that needs to be parsed into an SkBitmap. If
   // |icon_url_| is non-empty, it needs to be fetched and decoded into an
   // SkBitmap.
   std::string icon_base64_data_;
   GURL icon_url_;
   std::vector<unsigned char> fetched_icon_data_;
 
   // For fetching the icon, if needed.
   scoped_ptr<content::URLFetcher> url_fetcher_;
   net::URLRequestContextGetter* context_getter_; // Only usable on UI thread.
 
-  base::WeakPtr<UtilityProcessHost> utility_host_;
+  base::WeakPtr<content::UtilityProcessHost> utility_host_;
 
   // Flags for whether we're done doing icon decoding and manifest parsing.
   bool icon_decode_complete_;
   bool manifest_parse_complete_;
 
   // The results of succesful decoding/parsing.
   SkBitmap icon_;
   scoped_ptr<base::DictionaryValue> parsed_manifest_;
 
   // A details string for keeping track of any errors.
   std::string error_;
 
   // A code to distinguish between an error with the icon, and an error with the
   // manifest.
   Delegate::InstallHelperResultCode parse_error_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_WEBSTORE_INSTALL_HELPER_H_