[WIP] bindings: Introduce PropertyBag

Source/modules/geofencing/CircularRegion.cpp

 // Copyright 2014 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 "config.h"
 #include "modules/geofencing/CircularRegion.h"
 
 #include "bindings/core/v8/Dictionary.h"
 
 namespace blink {
 
 CircularRegionInit::CircularRegionInit(const Dictionary& init)
     : latitude(0)
     , longitude(0)
     , radius(0)
 {
-    DictionaryHelper::get(init, "id", id);
-    DictionaryHelper::get(init, "latitude", latitude);
-    DictionaryHelper::get(init, "longitude", longitude);
-    DictionaryHelper::get(init, "radius", radius);
+    init.get("id", id);
+    init.get("latitude", latitude);
+    init.get("longitude", longitude);
+    init.get("radius", radius);
 }
 
 CircularRegion* CircularRegion::create(const Dictionary& init)
 {
     return new CircularRegion(CircularRegionInit(init));
 }
 
 CircularRegion::CircularRegion(const CircularRegionInit& init)
     : GeofencingRegion(init.id)
     , m_latitude(init.latitude)
     , m_longitude(init.longitude)
     , m_radius(init.radius)
 {
 }
 
 } // namespace blink