Create an API around UtilityProcessHost and use that from chrome.

chrome/browser/extensions/webstore_install_helper.cc

 // 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.
 
 #include "chrome/browser/extensions/webstore_install_helper.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/values.h"
 #include "chrome/common/chrome_utility_messages.h"
 #include "content/public/browser/browser_thread.h"
+#include "content/public/browser/utility_process_host.h"
 #include "content/public/common/url_fetcher.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "net/url_request/url_request_status.h"
 
 using content::BrowserThread;
+using content::UtilityProcessHost;
 
 namespace {
 
 const char kImageDecodeError[] = "Image decode failed";
 
 }  // namespace
 
 WebstoreInstallHelper::WebstoreInstallHelper(
     Delegate* delegate,
     const std::string& id,
@@ skipping 32 matching lines @@
     url_fetcher_->SetRequestContext(context_getter_);
 
     url_fetcher_->Start();
     // We'll get called back in OnURLFetchComplete.
   }
 }
 
 void WebstoreInstallHelper::StartWorkOnIOThread() {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
   utility_host_ =
-      (new UtilityProcessHost(this, BrowserThread::IO))->AsWeakPtr();
-  utility_host_->set_use_linux_zygote(true);
+      UtilityProcessHost::Create(this, BrowserThread::IO)->AsWeakPtr();
+  utility_host_->EnableZygote();
   utility_host_->StartBatchMode();
 
   if (!icon_base64_data_.empty())
     utility_host_->Send(
         new ChromeUtilityMsg_DecodeImageBase64(icon_base64_data_));
 
   utility_host_->Send(new ChromeUtilityMsg_ParseJSON(manifest_));
 }
 
 void WebstoreInstallHelper::OnURLFetchComplete(
@@ skipping 101 matching lines @@
       base::Bind(&WebstoreInstallHelper::ReportResultFromUIThread, this));
 }
 
 void WebstoreInstallHelper::ReportResultFromUIThread() {
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (error_.empty() && parsed_manifest_.get())
     delegate_->OnWebstoreParseSuccess(id_, icon_, parsed_manifest_.release());
   else
     delegate_->OnWebstoreParseFailure(id_, parse_error_, error_);
 }