Cleanup: Remove unneeded forward declarations in ppapi.

ppapi/cpp/graphics_3d.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_CPP_GRAPHICS_3D_H_
 #define PPAPI_CPP_GRAPHICS_3D_H_
 
 #include "ppapi/c/ppb_graphics_3d.h"
 #include "ppapi/cpp/resource.h"
 
 /// @file
 /// This file defines the API to create a 3D rendering context in the browser.
 namespace pp {
 
 class CompletionCallback;
 class Instance;
-class Var;
 
 /// This class represents a 3D rendering context in the browser.
 class Graphics3D : public Resource {
  public:
   /// Default constructor for creating an is_null() Graphics3D object.
   Graphics3D();
 
   /// A constructor for creating and and initializing a 3D rendering context.
   /// The returned context is created off-screen and must be attached
   /// to a module instance using <code>Instance::BindGraphics</code> to draw on
@@ skipping 156 matching lines @@
   ///
   /// @return An int32_t containing <code>PP_ERROR_BADRESOURCE</code> if
   /// context is invalid or <code>PP_ERROR_BADARGUMENT</code> if callback is
   /// invalid.
   int32_t SwapBuffers(const CompletionCallback& cc);
 };
 
 }  // namespace pp
 
 #endif  // PPAPI_CPP_GRAPHICS_3D_H_
-