cleanup: Use EventRouter instead of ExtensionSystem::Get->event_router()

chrome/browser/extensions/extension_messages_apitest.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 "base/base64.h"
 #include "base/files/file_path.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/path_service.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 54 matching lines @@
                                       GURL event_url) {
     scoped_ptr<Event> event(new Event("test.onMessage", event_args.Pass()));
     event->restrict_to_browser_context = profile;
     event->event_url = event_url;
     return event.Pass();
   }
 
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE {
-    EventRouter* event_router = ExtensionSystem::Get(
-        content::Source<Profile>(source).ptr())->event_router();
+    EventRouter* event_router =
+        EventRouter::Get(content::Source<Profile>(source).ptr());
 
     // Sends four messages to the extension. All but the third message sent
     // from the origin http://b.com/ are supposed to arrive.
     event_router->BroadcastEvent(BuildEvent(
         BuildEventArguments(false, "no restriction"),
         content::Source<Profile>(source).ptr(),
         GURL()));
     event_router->BroadcastEvent(BuildEvent(
         BuildEventArguments(false, "http://a.com/"),
         content::Source<Profile>(source).ptr(),
@@ skipping 878 matching lines @@
   ui_test_utils::NavigateToURL(browser(), chromium_org_url());
   EXPECT_EQ(COULD_NOT_ESTABLISH_CONNECTION_ERROR ,
             CanConnectAndSendMessagesToMainFrame("invalid"));
 }
 
 #endif  // !defined(OS_WIN) - http://crbug.com/350517.
 
 }  // namespace
 
 };  // namespace extensions