Remove the HANDLED_EXTERNALLY status code.

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 <string>
 #include <vector>
@@ skipping 3129 matching lines @@
       &params.error_description);
   params.url = error.unreachableURL;
   params.showing_repost_interstitial = show_repost_interstitial;
   Send(new ViewHostMsg_DidFailProvisionalLoadWithError(
       routing_id_, params));
 
   // Don't display an error page if this is simply a cancelled load.  Aside
   // from being dumb, WebCore doesn't expect it and it will cause a crash.
   if (error.reason == net::ERR_ABORTED)
     return;
-  // Don't display an error message if the request was handled by an
-  // external protocol handler.
-  if (error.reason == net::ERR_UNKNOWN_URL_SCHEME)
-    return;
 
   // Make sure we never show errors in view source mode.
   frame->enableViewSourceMode(false);
 
   DocumentState* document_state = DocumentState::FromDataSource(ds);
   NavigationState* navigation_state = document_state->navigation_state();
 
   // If this is a failed back/forward/reload navigation, then we need to do a
   // 'replace' load.  This is necessary to avoid messing up session history.
   // Otherwise, we do a normal load, which simulates a 'go' navigation as far
@@ skipping 2955 matching lines @@
 
   updating_frame_tree_ = true;
   active_frame_id_map_.clear();
 
   target_process_id_ = process_id;
   target_routing_id_ = route_id;
   CreateFrameTree(webview()->mainFrame(), frames);
 
   updating_frame_tree_ = false;
 }