Standardize usage of virtual/override/final specifiers.

components/invalidation/push_client_channel_unittest.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 <string>
 
 #include "base/compiler_specific.h"
 #include "components/invalidation/push_client_channel.h"
 #include "jingle/notifier/listener/fake_push_client.h"
 #include "jingle/notifier/listener/notification_defines.h"
@@ skipping 11 matching lines @@
         push_client_channel_(
             scoped_ptr<notifier::PushClient>(fake_push_client_)),
         last_invalidator_state_(DEFAULT_INVALIDATION_ERROR) {
     push_client_channel_.AddObserver(this);
     push_client_channel_.SetMessageReceiver(
         invalidation::NewPermanentCallback(
             this, &PushClientChannelTest::OnIncomingMessage));
     push_client_channel_.SetSystemResources(NULL);
   }
 
-  virtual ~PushClientChannelTest() {
+  ~PushClientChannelTest() override {
     push_client_channel_.RemoveObserver(this);
   }
 
   void OnNetworkChannelStateChanged(
       InvalidatorState invalidator_state) override {
     last_invalidator_state_ = invalidator_state;
   }
 
   void OnIncomingMessage(std::string incoming_message) {
     last_message_ = incoming_message;
@@ skipping 200 matching lines @@
         &service_context,
         &scheduling_hash));
     EXPECT_EQ(kMessage, message);
     EXPECT_EQ(kServiceContext, service_context);
     EXPECT_EQ(kSchedulingHash, scheduling_hash);
   }
 }
 
 }  // namespace
 }  // namespace syncer