Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/extensions/api/api_function.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/api/api_function.h"
 
 #include "base/bind.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
+#include "extensions/browser/extension_system.h"
 
 using content::BrowserThread;
 
 namespace extensions {
 
 ApiFunction::ApiFunction() {
 }
 
 ApiFunction::~ApiFunction() {
 }
@@ skipping 50 matching lines @@
       "specify a different thread or derive from a different class.";
   AsyncWorkStart();
 }
 
 void AsyncApiFunction::RespondOnUIThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   SendResponse(Respond());
 }
 
 }  // namespace extensions