Standardize usage of virtual/override/final in gpu/

gpu/command_buffer/service/common_decoder.h

 // Copyright (c) 2012 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.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_COMMON_DECODER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_COMMON_DECODER_H_
 
 #include <map>
 #include <stack>
 #include <string>
@@ skipping 77 matching lines @@
       return temp <= size_ && temp >= offset;
     }
 
     size_t size_;
     ::scoped_ptr<int8[]> data_;
 
     DISALLOW_COPY_AND_ASSIGN(Bucket);
   };
 
   CommonDecoder();
-  virtual ~CommonDecoder();
+  ~CommonDecoder() override;
 
   // Sets the engine, to get shared memory buffers from, and to set the token
   // to.
   void set_engine(CommandBufferEngine* engine) {
     engine_ = engine;
   }
   CommandBufferEngine* engine() const { return engine_; }
 
   // Creates a bucket. If the bucket already exists returns that bucket.
   Bucket* CreateBucket(uint32 bucket_id);
@@ skipping 57 matching lines @@
   CommandBufferEngine* engine_;
 
   typedef std::map<uint32, linked_ptr<Bucket> > BucketMap;
   BucketMap buckets_;
 };
 
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_COMMON_DECODER_H_