Split ExtensionSystem interface from ExtensionSystemImpl implementation, part 1.

chrome/browser/extensions/extension_web_contents_observer.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/extension_web_contents_observer.h"
 
 #include "chrome/browser/extensions/api/messaging/message_service.h"
 #include "chrome/browser/extensions/error_console/error_console.h"
 #include "chrome/browser/extensions/extension_service.h"
-#include "chrome/browser/extensions/extension_system.h"
 #include "chrome/common/extensions/api/messaging/message.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/common/url_constants.h"
 #include "content/public/browser/child_process_security_policy.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/browser/extension_registry.h"
+#include "extensions/browser/extension_system.h"
 #include "extensions/browser/view_type_utils.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension_urls.h"
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(extensions::ExtensionWebContentsObserver);
 
 namespace extensions {
 
 ExtensionWebContentsObserver::ExtensionWebContentsObserver(
     content::WebContents* web_contents)
@@ skipping 117 matching lines @@
     return NULL;
 
   std::string extension_id = site.host();
   ExtensionRegistry* registry = ExtensionRegistry::Get(browser_context_);
 
   // Reload the extension if it has crashed.
   // TODO(yoz): This reload doesn't happen synchronously for unpacked
   //            extensions. It seems to be fast enough, but there is a race.
   //            We should delay loading until the extension has reloaded.
   if (registry->GetExtensionById(extension_id, ExtensionRegistry::TERMINATED)) {
-    ExtensionSystem::GetForBrowserContext(browser_context_)->
+    ExtensionSystem::Get(browser_context_)->
         extension_service()->ReloadExtension(extension_id);
   }
 
   // May be null if the extension doesn't exist, for example if somebody typos
   // a chrome-extension:// URL.
   return registry->enabled_extensions().GetByID(extension_id);
 }
 
 }  // namespace extensions