Add a UsbService::Observer function for cleanup actions.

extensions/browser/api/device_permissions_manager.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 "extensions/browser/api/device_permissions_manager.h"
 
 #include "base/bind.h"
 #include "base/memory/singleton.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
@@ skipping 380 matching lines @@
 
   void Start() {
     DCHECK_CURRENTLY_ON(BrowserThread::FILE);
     UsbService* service = device::DeviceClient::Get()->GetUsbService();
     if (service) {
       observer_.Add(service);
     }
   }
 
  private:
-  void OnDeviceRemoved(scoped_refptr<UsbDevice> device) override {
+  void OnDeviceRemovedCleanup(scoped_refptr<UsbDevice> device) override {
     DCHECK_CURRENTLY_ON(BrowserThread::FILE);
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&DevicePermissionsManager::OnDeviceRemoved,
                    device_permissions_manager_, device));
   }
 
   base::WeakPtr<DevicePermissionsManager> device_permissions_manager_;
   ScopedObserver<UsbService, UsbService::Observer> observer_;
 };
@@ skipping 212 matching lines @@
 
 BrowserContext* DevicePermissionsManagerFactory::GetBrowserContextToUse(
     BrowserContext* context) const {
   // Return the original (possibly off-the-record) browser context so that a
   // separate instance of the DevicePermissionsManager is used in incognito
   // mode. The parent class's implemenation returns NULL.
   return context;
 }
 
 }  // namespace extensions