Replace NPObject usage in ppapi with gin

ppapi/shared_impl/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/var.h"
 
 #include <limits>
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 62 matching lines @@
     }
     default:
       return "[Invalid var]";
   }
 }
 
 StringVar* Var::AsStringVar() { return NULL; }
 
 ArrayBufferVar* Var::AsArrayBufferVar() { return NULL; }
 
-NPObjectVar* Var::AsNPObjectVar() { return NULL; }
-
 V8ObjectVar* Var::AsV8ObjectVar() { return NULL; }
 
 ProxyObjectVar* Var::AsProxyObjectVar() { return NULL; }
 
 ArrayVar* Var::AsArrayVar() { return NULL; }
 
 DictionaryVar* Var::AsDictionaryVar() { return NULL; }
 
 ResourceVar* Var::AsResourceVar() { return NULL; }
 
@@ skipping 93 matching lines @@
   if (var.type != PP_VARTYPE_ARRAY_BUFFER)
     return NULL;
   scoped_refptr<Var> var_object(
       PpapiGlobals::Get()->GetVarTracker()->GetVar(var));
   if (!var_object.get())
     return NULL;
   return var_object->AsArrayBufferVar();
 }
 
 }  // namespace ppapi