Add a Content API around BrowserChildProcessHost, similar to what was done with ChildProcessHost....

chrome/browser/web_resource/web_resource_service.cc

 // 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.
 
 #include "chrome/browser/web_resource/web_resource_service.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/message_loop.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_utility_messages.h"
 #include "chrome/common/web_resource/web_resource_unpacker.h"
@@ skipping 211 matching lines @@
 
   std::string data;
   source->GetResponseAsString(&data);
 
   // UnpackerClient releases itself.
   UnpackerClient* client = new UnpackerClient(this);
   client->Start(data);
 
   Release();
 }