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

chrome/browser/chromeos/file_system_provider/service.cc

 // Copyright 2014 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_system_provider/service.h"
 
 #include "base/files/file_path.h"
 #include "base/stl_util.h"
 #include "chrome/browser/chromeos/file_system_provider/mount_path_util.h"
 #include "chrome/browser/chromeos/file_system_provider/observer.h"
@@ skipping 95 matching lines @@
   // Store the file system descriptor. Use the mount point name as the file
   // system provider file system id.
   // Examples:
   //   file_system_id = 41
   //   mount_point_name = file_system_id = b33f1337-41-5aa5
   //   mount_point_path = /provided/b33f1337-41-5aa5
   ProvidedFileSystemInfo file_system_info(
       extension_id, file_system_id, file_system_name, mount_point_path);
 
   // The event router may be NULL for unit tests.
-  extensions::EventRouter* event_router =
-      extensions::ExtensionSystem::Get(profile_)->event_router();
+  extensions::EventRouter* router = extensions::EventRouter::Get(profile_);
 
   ProvidedFileSystemInterface* file_system =
-      file_system_factory_.Run(event_router, file_system_info);
+      file_system_factory_.Run(router, file_system_info);
   DCHECK(file_system);
   file_system_map_[file_system_id] = file_system;
 
   FOR_EACH_OBSERVER(
       Observer,
       observers_,
       OnProvidedFileSystemMount(file_system_info, base::File::FILE_OK));
 
   next_id_++;
   return file_system_id;
@@ skipping 97 matching lines @@
   // invoked, and observers notified, so there is no need to call them now.
   if (error != base::File::FILE_OK) {
     FOR_EACH_OBSERVER(Observer,
                       observers_,
                       OnProvidedFileSystemUnmount(file_system_info, error));
   }
 }
 
 }  // namespace file_system_provider
 }  // namespace chromeos