Make the PPP wrappers take an Instance*.

ppapi/cpp/graphics_3d_client.cc

 // 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.
 
 #include "ppapi/cpp/graphics_3d_client.h"
 
 #include "ppapi/c/ppp_graphics_3d.h"
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/module.h"
@@ skipping 12 matching lines @@
     return;
   return static_cast<Graphics3DClient*>(object)->Graphics3DContextLost();
 }
 
 static PPP_Graphics3D graphics3d_interface = {
   &Graphics3D_ContextLost,
 };
 
 }  // namespace
 
-Graphics3DClient::Graphics3DClient(const InstanceHandle& instance)
+Graphics3DClient::Graphics3DClient(Instance* instance)
     : associated_instance_(instance) {
   Module::Get()->AddPluginInterface(kPPPGraphics3DInterface,
                                     &graphics3d_interface);
-  Instance::AddPerInstanceObject(instance, kPPPGraphics3DInterface, this);
+  instance->AddPerInstanceObject(kPPPGraphics3DInterface, this);
 }
 
 Graphics3DClient::~Graphics3DClient() {
   Instance::RemovePerInstanceObject(associated_instance_,
                                     kPPPGraphics3DInterface, this);
 }
 
 }  // namespace pp