Simplest backport of 117417.

content/browser/renderer_host/render_view_host.cc

 // Copyright (c) 2011 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/browser/renderer_host/render_view_host.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 1308 matching lines @@
     // The renderer treats all URLs in the about: scheme as being about:blank.
     // Canonicalize about: URLs to about:blank.
     *url = GURL(chrome::kAboutBlankURL);
   }
 
   if (!policy->CanRequestURL(renderer_id, *url)) {
     // If this renderer is not permitted to request this URL, we invalidate the
     // URL.  This prevents us from storing the blocked URL and becoming confused
     // later.
     VLOG(1) << "Blocked URL " << url->spec();
-    *url = GURL();
+    *url = GURL(chrome::kAboutBlankURL);
   }
 }
 
 void RenderViewHost::SetAltErrorPageURL(const GURL& url) {
   Send(new ViewMsg_SetAltErrorPageURL(routing_id(), url));
 }
 
 void RenderViewHost::ExitFullscreen() {
   RejectMouseLockOrUnlockIfNecessary();
 
@@ skipping 208 matching lines @@
 
 void RenderViewHost::OnWebUISend(const GURL& source_url,
                                  const std::string& name,
                                  const base::ListValue& args) {
   delegate_->WebUISend(this, source_url, name, args);
 }
 
 void RenderViewHost::ClearPowerSaveBlockers() {
   STLDeleteValues(&power_save_blockers_);
 }