Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/chromeos/file_manager/fileapi_util.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/chromeos/file_manager/fileapi_util.h"
 
 #include "base/files/file_path.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/storage_partition.h"
+#include "extensions/browser/extension_system.h"
 #include "net/base/escape.h"
 #include "url/gurl.h"
 #include "webkit/browser/fileapi/file_system_context.h"
 #include "webkit/common/fileapi/file_system_util.h"
 
 namespace file_manager {
 namespace util {
 
 namespace {
 
@@ skipping 82 matching lines @@
 
   // Find if this file path is managed by the external backend.
   if (!backend->GetVirtualPath(absolute_path, virtual_path))
     return false;
 
   return true;
 }
 
 }  // namespace util
 }  // namespace file_manager