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

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index d1bd5effed2e6a901f6a02549eaeb0867da3b6b6..05e72847fa5ee4e4eaf1fee013733eda51ffffb4 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -3954,33 +3954,22 @@ double RenderViewImpl::zoomFactorToZoomLevel(double factor) const {
 }
 
 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));
 }