Tweaks to PPB_VarArrayBuffer in preperation for taking out of Dev.

ppapi/proxy/plugin_array_buffer_var.h

 // Copyright (c) 2011 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 PPAPI_PROXY_PLUGIN_ARRAY_BUFFER_VAR_H_
 #define PPAPI_PROXY_PLUGIN_ARRAY_BUFFER_VAR_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "ppapi/c/pp_stdint.h"
 #include "ppapi/shared_impl/var.h"
 
 namespace ppapi {
 
 // Represents a plugin-side ArrayBufferVar. In the plugin process, it's
 // owned as a vector.
 class PluginArrayBufferVar : public ArrayBufferVar {
  public:
   explicit PluginArrayBufferVar(uint32 size_in_bytes);
   virtual ~PluginArrayBufferVar();
 
   // ArrayBufferVar implementation.
   virtual void* Map() OVERRIDE;
+  virtual void Unmap() OVERRIDE;
   virtual uint32 ByteLength() OVERRIDE;
 
  private:
   // TODO(dmichael): Use shared memory for this.
   std::vector<uint8> buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginArrayBufferVar);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_PLUGIN_ARRAY_BUFFER_VAR_H_