Replace NPObject usage in ppapi with gin

ppapi/shared_impl/scoped_pp_var.h

Index: ppapi/shared_impl/scoped_pp_var.h
diff --git a/ppapi/shared_impl/scoped_pp_var.h b/ppapi/shared_impl/scoped_pp_var.h
index f1e134782ef88a56a338b0739eeb6c1c10292185..e55674cd513bee3af6cb5c5970ef158b04b7d42b 100644
--- a/ppapi/shared_impl/scoped_pp_var.h
+++ b/ppapi/shared_impl/scoped_pp_var.h
@@ -63,13 +63,13 @@ class PPAPI_SHARED_EXPORT ScopedPPVarArray {
 
   // Passes ownership of the vars and the underlying array memory to the caller.
   // Note that the memory has been allocated with PPB_Memory_Dev.
-  PP_Var* Release(const PassPPBMemoryAllocatedArray&, size_t* size);
+  PP_Var* Release(const PassPPBMemoryAllocatedArray&);
 
   PP_Var* get() { return array_; }
   size_t size() { return size_; }
 
-  // Adds a ref to |var|. The refcount of the existing var will be decremented.
-  void Set(size_t index, PP_Var var);
+  // Takes a ref to |var|. The refcount of the existing var will be decremented.
+  void Set(size_t index, const ScopedPPVar& var);
   const PP_Var& operator[](size_t index) { return array_[index]; }
 
  private: