Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/extensions/api/web_navigation/web_navigation_api_helpers.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.
 
 // Implements the Chrome Extensions WebNavigation API.
 
 #include "chrome/browser/extensions/api/web_navigation/web_navigation_api_helpers.h"
 
 #include "base/json/json_writer.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/api/web_navigation/web_navigation_api_constants.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/api/web_navigation.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/page_transition_types.h"
 #include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_system.h"
 #include "extensions/common/event_filtering_info.h"
 #include "net/base/net_errors.h"
 
 namespace extensions {
 
 namespace keys = web_navigation_api_constants;
 namespace web_navigation = api::web_navigation;
 
 namespace web_navigation_api_helpers {
 
@@ skipping 210 matching lines @@
 
   DispatchEvent(browser_context,
                 web_navigation::OnTabReplaced::kEventName,
                 args.Pass(),
                 GURL());
 }
 
 }  // namespace web_navigation_api_helpers
 
 }  // namespace extensions