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

content/renderer/render_view_impl.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 "content/renderer/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 3936 matching lines @@
 
 double RenderViewImpl::zoomLevelToZoomFactor(double zoom_level) const {
   return ZoomLevelToZoomFactor(zoom_level);
 }
 
 double RenderViewImpl::zoomFactorToZoomLevel(double factor) const {
   return ZoomFactorToZoomLevel(factor);
 }
 
 void RenderViewImpl::registerProtocolHandler(const WebString& scheme,
-                                             const WebURL& base_url,
                                              const WebURL& url,
                                              const WebString& title) {
   bool user_gesture = WebUserGestureIndicator::isProcessingUserGesture();
-  GURL base(base_url);
-  GURL absolute_url = base.Resolve(base::UTF16ToUTF8(url.string()));
-  if (base.GetOrigin() != absolute_url.GetOrigin()) {
-    return;
-  }
   Send(new ViewHostMsg_RegisterProtocolHandler(routing_id_,
                                                base::UTF16ToUTF8(scheme),
-                                               absolute_url,
+                                               url,
                                                title,
                                                user_gesture));
 }
 
 void RenderViewImpl::unregisterProtocolHandler(const WebString& scheme,
-                                               const WebURL& base_url,
                                                const WebURL& url) {
   bool user_gesture = WebUserGestureIndicator::isProcessingUserGesture();
-  GURL base(base_url);
-  GURL absolute_url = base.Resolve(base::UTF16ToUTF8(url.string()));
-  if (base.GetOrigin() != absolute_url.GetOrigin())
-    return;
   Send(new ViewHostMsg_UnregisterProtocolHandler(routing_id_,
                                                  base::UTF16ToUTF8(scheme),
-                                                 absolute_url,
+                                                 url,
                                                  user_gesture));
 }
 
 blink::WebPageVisibilityState RenderViewImpl::visibilityState() const {
   blink::WebPageVisibilityState current_state = is_hidden() ?
       blink::WebPageVisibilityStateHidden :
       blink::WebPageVisibilityStateVisible;
   blink::WebPageVisibilityState override_state = current_state;
   // TODO(jam): move this method to WebFrameClient.
   if (GetContentClient()->renderer()->
@@ skipping 306 matching lines @@
     std::vector<gfx::Size> sizes;
     ConvertToFaviconSizes(icon_urls[i].sizes(), &sizes);
     if (!url.isEmpty())
       urls.push_back(
           FaviconURL(url, ToFaviconType(icon_urls[i].iconType()), sizes));
   }
   SendUpdateFaviconURL(urls);
 }
 
 }  // namespace content