Replace NPObject usage in ppapi with gin

ppapi/shared_impl/scoped_pp_var.cc

 // Copyright (c) 2012 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/shared_impl/scoped_pp_var.h"
 
 #include "ppapi/c/dev/ppb_memory_dev.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/var_tracker.h"
 #include "ppapi/thunk/thunk.h"
@@ skipping 55 matching lines @@
 }
 
 ScopedPPVarArray::~ScopedPPVarArray() {
   for (size_t i = 0; i < size_; ++i)
     CallRelease(array_[i]);
   if (size_ > 0)
     thunk::GetPPB_Memory_Dev_0_1_Thunk()->MemFree(array_);
 
 }
 
-PP_Var* ScopedPPVarArray::Release(const PassPPBMemoryAllocatedArray&,
-                                  size_t* size) {
+PP_Var* ScopedPPVarArray::Release(const PassPPBMemoryAllocatedArray&) {
   PP_Var* result = array_;
-  *size = size_;
   array_ = NULL;
   size_ = 0;
   return result;
 }
 
-void ScopedPPVarArray::Set(size_t index, PP_Var var) {
+void ScopedPPVarArray::Set(size_t index, const ScopedPPVar& var) {
   DCHECK(index < size_);
-  CallAddRef(var);
+  CallAddRef(var.get());
   CallRelease(array_[index]);
-  array_[index] = var;
+  array_[index] = var.get();
 }
 
 }  // namespace ppapi