Standardize usage of virtual/override/final in mojo/

mojo/gles2/command_buffer_client_impl.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 "mojo/gles2/command_buffer_client_impl.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "base/process/process_handle.h"
@@ skipping 46 matching lines @@
   }
 
   CommandBufferStatePtr WaitForProgress() {
     if (!WaitForIncomingMethodCall())
       return CommandBufferStatePtr();
     return command_buffer_state_.Pass();
   }
 
  private:
   // CommandBufferSyncClient methods:
-  virtual void DidInitialize(bool success) override {
+  void DidInitialize(bool success) override {
     initialized_successfully_ = success;
   }
-  virtual void DidMakeProgress(CommandBufferStatePtr state) override {
+  void DidMakeProgress(CommandBufferStatePtr state) override {
     command_buffer_state_ = state.Pass();
   }
 
   bool initialized_successfully_;
   CommandBufferStatePtr command_buffer_state_;
 };
 
 CommandBufferClientImpl::CommandBufferClientImpl(
     CommandBufferDelegate* delegate,
     const MojoAsyncWaiter* async_waiter,
@@ skipping 204 matching lines @@
     DidDestroy();
     return;
   }
 
   if (state->generation - last_state_.generation < 0x80000000U)
     last_state_ = state.To<State>();
 }
 
 }  // namespace gles2
 }  // namespace mojo