Add the "virtual" keyword on method overrides that are missing it.

webkit/glue/plugins/pepper_buffer.h

 // Copyright (c) 2010 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 WEBKIT_GLUE_PLUGINS_PEPPER_BUFFER_H_
 #define WEBKIT_GLUE_PLUGINS_PEPPER_BUFFER_H_
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
 #include "webkit/glue/plugins/pepper_resource.h"
@@ skipping 14 matching lines @@
 
   // Returns true if this buffer is mapped. False means that the buffer is
   // either invalid or not mapped.
   bool is_mapped() const { return !!mem_buffer_.get(); }
 
   // Returns a pointer to the interface implementing PPB_Buffer that is
   // exposed to the plugin.
   static const PPB_Buffer_Dev* GetInterface();
 
   // Resource overrides.
-  Buffer* AsBuffer() { return this; }
+  virtual Buffer* AsBuffer();
 
   // PPB_Buffer implementation.
   bool Init(uint32_t size);
   void Describe(uint32_t* size_in_bytes) const;
   void* Map();
   void Unmap();
 
   // Swaps the guts of this buffer with another.
   void Swap(Buffer* other);
 
  private:
   uint32_t size_;
   scoped_array<unsigned char> mem_buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(Buffer);
 };
 
 }  // namespace pepper
 
 #endif  // WEBKIT_GLUE_PLUGINS_PEPPER_BUFFER_H_