Make the PPP wrappers take an Instance*.

ppapi/cpp/dev/printing_dev.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/dev/printing_dev.h"
 
 #include "ppapi/cpp/instance.h"
 #include "ppapi/cpp/instance_handle.h"
 #include "ppapi/cpp/module.h"
 #include "ppapi/cpp/module_impl.h"
@@ skipping 52 matching lines @@
 const PPP_Printing_Dev ppp_printing = {
   &QuerySupportedFormats,
   &Begin,
   &PrintPages,
   &End,
   &IsScalingDisabled
 };
 
 }  // namespace
 
-Printing_Dev::Printing_Dev(const InstanceHandle& instance)
+Printing_Dev::Printing_Dev(Instance* instance)
       : associated_instance_(instance) {
   Module::Get()->AddPluginInterface(kPPPPrintingInterface, &ppp_printing);
-  Instance::AddPerInstanceObject(instance, kPPPPrintingInterface, this);
+  instance->AddPerInstanceObject(kPPPPrintingInterface, this);
 }
 
 Printing_Dev::~Printing_Dev() {
   Instance::RemovePerInstanceObject(associated_instance_,
                                     kPPPPrintingInterface, this);
 }
 
 }  // namespace pp