Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/extensions/api/sockets_udp/udp_socket_event_dispatcher.cc

 // Copyright 2013 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/api/sockets_udp/udp_socket_event_dispatcher.h"
 
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/socket/udp_socket.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_system.h"
 #include "net/base/net_errors.h"
 
 namespace extensions {
 namespace api {
 
 using content::BrowserThread;
 
 static base::LazyInstance<ProfileKeyedAPIFactory<UDPSocketEventDispatcher> >
 g_factory = LAZY_INSTANCE_INITIALIZER;
 
@@ skipping 150 matching lines @@
   if (!g_browser_process->profile_manager()->IsValidProfile(profile))
     return;
 
   EventRouter* router = ExtensionSystem::Get(profile)->event_router();
   if (router)
     router->DispatchEventToExtension(extension_id, event.Pass());
 }
 
 }  // namespace api
 }  // namespace extensions