Replace NPObject usage in ppapi with gin

ppapi/shared_impl/scoped_pp_var.cc

Index: ppapi/shared_impl/scoped_pp_var.cc
diff --git a/ppapi/shared_impl/scoped_pp_var.cc b/ppapi/shared_impl/scoped_pp_var.cc
index 95748392fce2cfae1c5b045ed5e591cc91cc669c..a6d1aa34997713d08504b24b6b5e962444496967 100644
--- a/ppapi/shared_impl/scoped_pp_var.cc
+++ b/ppapi/shared_impl/scoped_pp_var.cc
@@ -73,20 +73,18 @@ ScopedPPVarArray::~ScopedPPVarArray() {
 
 }
 
-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