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

chrome/browser/extensions/api/bluetooth/bluetooth_private_api.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/extensions/api/bluetooth/bluetooth_private_api.h"
 
 #include "base/callback.h"
 #include "base/lazy_instance.h"
 #include "base/strings/string_util.h"
 #include "chrome/browser/extensions/api/bluetooth/bluetooth_api.h"
 #include "chrome/browser/extensions/api/bluetooth/bluetooth_event_router.h"
 #include "chrome/common/extensions/api/bluetooth_private.h"
 #include "device/bluetooth/bluetooth_adapter.h"
 #include "device/bluetooth/bluetooth_adapter_factory.h"
-#include "extensions/browser/extension_system.h"
 
 namespace bt_private = extensions::api::bluetooth_private;
 
 namespace extensions {
 
 static base::LazyInstance<BrowserContextKeyedAPIFactory<BluetoothPrivateAPI> >
     g_factory = LAZY_INSTANCE_INITIALIZER;
 
 // static
 BrowserContextKeyedAPIFactory<BluetoothPrivateAPI>*
 BluetoothPrivateAPI::GetFactoryInstance() {
   return g_factory.Pointer();
 }
 
 BluetoothPrivateAPI::BluetoothPrivateAPI(content::BrowserContext* context)
     : browser_context_(context) {
-  ExtensionSystem::Get(browser_context_)->event_router()->RegisterObserver(
-      this, bt_private::OnPairing::kEventName);
+  EventRouter::Get(browser_context_)
+      ->RegisterObserver(this, bt_private::OnPairing::kEventName);
 }
 
 BluetoothPrivateAPI::~BluetoothPrivateAPI() {}
 
 void BluetoothPrivateAPI::Shutdown() {
-  ExtensionSystem::Get(browser_context_)->event_router()->UnregisterObserver(
-      this);
+  EventRouter::Get(browser_context_)->UnregisterObserver(this);
 }
 
 void BluetoothPrivateAPI::OnListenerAdded(const EventListenerInfo& details) {
   // This function can be called multiple times for the same JS listener, for
   // example, once for the addListener call and again if it is a lazy listener.
   if (!details.browser_context)
     return;
 
   BluetoothAPI::Get(browser_context_)->event_router()->AddPairingDelegate(
       details.extension_id);
@@ skipping 223 matching lines @@
     }
   }
 
   SendResponse(true);
   return true;
 }
 
 }  // namespace api
 
 }  // namespace extensions