Create an API around UtilityProcessHost and use that from chrome.

chrome/browser/extensions/webstore_install_helper.h

Index: chrome/browser/extensions/webstore_install_helper.h
===================================================================
--- chrome/browser/extensions/webstore_install_helper.h	(revision 120256)
+++ chrome/browser/extensions/webstore_install_helper.h	(working copy)
@@ -6,12 +6,15 @@
 #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 {
@@ -19,6 +22,10 @@
 class ListValue;
 }
 
+namespace content {
+class UtilityProcessHost;
+}
+
 namespace net {
 class URLRequestContextGetter;
 }
@@ -27,7 +34,7 @@
 // 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 {
@@ -74,7 +81,7 @@
   // 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.
@@ -104,7 +111,7 @@
   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_;