<webview>: Navigate to about:blank if attempting to navigate to bad URL

extensions/browser/guest_view/web_view/web_view_guest.cc

 // 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 "extensions/browser/guest_view/web_view/web_view_guest.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/public/browser/browser_context.h"
@@ skipping 861 matching lines @@
   // This will block the embedder trying to load unwanted schemes, e.g.
   // chrome://settings.
   bool scheme_is_blocked =
       (!content::ChildProcessSecurityPolicy::GetInstance()->IsWebSafeScheme(
            url.scheme()) &&
        !url.SchemeIs(url::kAboutScheme)) ||
       url.SchemeIs(url::kJavaScriptScheme);
   if (scheme_is_blocked || !url.is_valid()) {
     LoadAbort(true /* is_top_level */, url,
               net::ErrorToShortString(net::ERR_ABORTED));
+    NavigateGuest("about:blank", true /* force_navigation */);

[lazyboy, 2015/02/03 09:07:46]

s/"about:blank"/kAboutBlankURL

     return;
   }
   if (!force_navigation && (src_ == url))
     return;
 
   GURL validated_url(url);
   web_contents()->GetRenderProcessHost()->FilterURL(false, &validated_url);
   // As guests do not swap processes on navigation, only navigations to
   // normal web URLs are supported.  No protocol handlers are installed for
   // other schemes (e.g., WebUI or extensions), and no permissions or bindings
@@ skipping 321 matching lines @@
       WebViewGuest::From(owner_web_contents()->GetRenderProcessHost()->GetID(),
                          new_window_instance_id);
   if (!guest)
     return;
 
   if (!allow)
     guest->Destroy();
 }
 
 }  // namespace extensions