Standardize usage of virtual/override/final in mojo/

mojo/edk/embedder/simple_platform_shared_buffer.h

 // 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.
 
 #ifndef MOJO_EDK_EMBEDDER_SIMPLE_PLATFORM_SHARED_BUFFER_H_
 #define MOJO_EDK_EMBEDDER_SIMPLE_PLATFORM_SHARED_BUFFER_H_
 
 #include <stddef.h>
 
 #include "base/macros.h"
 #include "mojo/edk/embedder/platform_shared_buffer.h"
 #include "mojo/edk/system/system_impl_export.h"
 
 namespace mojo {
 namespace embedder {
 
 // A simple implementation of |PlatformSharedBuffer|.
 class MOJO_SYSTEM_IMPL_EXPORT SimplePlatformSharedBuffer
     : public PlatformSharedBuffer {
  public:
   // Creates a shared buffer of size |num_bytes| bytes (initially zero-filled).
   // |num_bytes| must be nonzero. Returns null on failure.
   static SimplePlatformSharedBuffer* Create(size_t num_bytes);
 
   static SimplePlatformSharedBuffer* CreateFromPlatformHandle(
       size_t num_bytes,
       ScopedPlatformHandle platform_handle);
 
   // |PlatformSharedBuffer| implementation:
-  virtual size_t GetNumBytes() const override;
-  virtual scoped_ptr<PlatformSharedBufferMapping> Map(size_t offset,
-                                                      size_t length) override;
-  virtual bool IsValidMap(size_t offset, size_t length) override;
-  virtual scoped_ptr<PlatformSharedBufferMapping> MapNoCheck(
-      size_t offset,
-      size_t length) override;
-  virtual ScopedPlatformHandle DuplicatePlatformHandle() override;
-  virtual ScopedPlatformHandle PassPlatformHandle() override;
+  size_t GetNumBytes() const override;
+  scoped_ptr<PlatformSharedBufferMapping> Map(size_t offset,
+                                              size_t length) override;
+  bool IsValidMap(size_t offset, size_t length) override;
+  scoped_ptr<PlatformSharedBufferMapping> MapNoCheck(size_t offset,
+                                                     size_t length) override;
+  ScopedPlatformHandle DuplicatePlatformHandle() override;
+  ScopedPlatformHandle PassPlatformHandle() override;
 
  private:
   explicit SimplePlatformSharedBuffer(size_t num_bytes);
-  virtual ~SimplePlatformSharedBuffer();
+  ~SimplePlatformSharedBuffer() override;
 
   // Implemented in simple_platform_shared_buffer_{posix,win}.cc:
 
   // This is called by |Create()| before this object is given to anyone.
   bool Init();
 
   // This is like |Init()|, but for |CreateFromPlatformHandle()|. (Note: It
   // should verify that |platform_handle| is an appropriate handle for the
   // claimed |num_bytes_|.)
   bool InitFromPlatformHandle(ScopedPlatformHandle platform_handle);
 
   // The platform-dependent part of |Map()|; doesn't check arguments.
   scoped_ptr<PlatformSharedBufferMapping> MapImpl(size_t offset, size_t length);
 
   const size_t num_bytes_;
 
   // This is set in |Init()|/|InitFromPlatformHandle()| and never modified
   // (except by |PassPlatformHandle()|; see the comments above its declaration),
   // hence does not need to be protected by a lock.
   ScopedPlatformHandle handle_;
 
   DISALLOW_COPY_AND_ASSIGN(SimplePlatformSharedBuffer);
 };
 
 // An implementation of |PlatformSharedBufferMapping|, produced by
 // |SimplePlatformSharedBuffer|.
 class MOJO_SYSTEM_IMPL_EXPORT SimplePlatformSharedBufferMapping
     : public PlatformSharedBufferMapping {
  public:
-  virtual ~SimplePlatformSharedBufferMapping();
+  ~SimplePlatformSharedBufferMapping() override;
 
-  virtual void* GetBase() const override;
-  virtual size_t GetLength() const override;
+  void* GetBase() const override;
+  size_t GetLength() const override;
 
  private:
   friend class SimplePlatformSharedBuffer;
 
   SimplePlatformSharedBufferMapping(void* base,
                                     size_t length,
                                     void* real_base,
                                     size_t real_length)
       : base_(base),
         length_(length),
         real_base_(real_base),
         real_length_(real_length) {}
   void Unmap();
 
   void* const base_;
   const size_t length_;
 
   void* const real_base_;
   const size_t real_length_;
 
   DISALLOW_COPY_AND_ASSIGN(SimplePlatformSharedBufferMapping);
 };
 
 }  // namespace embedder
 }  // namespace mojo
 
 #endif  // MOJO_EDK_EMBEDDER_SIMPLE_PLATFORM_SHARED_BUFFER_H_