Same origin check is not required anymore as blink checks for the same.

content/renderer/render_view_impl.h

 // 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.
 
 #ifndef CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <deque>
 #include <map>
 #include <set>
@@ skipping 420 matching lines @@
   virtual void postAccessibilityEvent(
       const blink::WebAXObject& obj, blink::WebAXEvent event);
   virtual void didUpdateInspectorSetting(const blink::WebString& key,
                                          const blink::WebString& value);
   virtual blink::WebSpeechRecognizer* speechRecognizer();
   virtual void zoomLimitsChanged(double minimum_level, double maximum_level);
   virtual void zoomLevelChanged();
   virtual double zoomLevelToZoomFactor(double zoom_level) const;
   virtual double zoomFactorToZoomLevel(double factor) const;
   virtual void registerProtocolHandler(const blink::WebString& scheme,
-                                       const blink::WebURL& base_url,
                                        const blink::WebURL& url,
                                        const blink::WebString& title);
   virtual void unregisterProtocolHandler(const blink::WebString& scheme,
-                                         const blink::WebURL& base_url,
                                          const blink::WebURL& url);
   virtual blink::WebPageVisibilityState visibilityState() const;
   virtual blink::WebPushClient* webPushClient();
   virtual void draggableRegionsChanged();
 
 #if defined(OS_ANDROID)
   virtual void scheduleContentIntent(const blink::WebURL& intent);
   virtual void cancelScheduledContentIntents();
   virtual blink::WebContentDetectionResult detectContentAround(
       const blink::WebHitTestResult& touch_hit);
@@ skipping 704 matching lines @@
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_