This patch enables "mailto" links in WebViews.

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 "components/browsing_data/storage_partition_http_cache_data_remover.h"
@@ skipping 792 matching lines @@
 
   find_helper_.CancelAllFindSessions();
 }
 
 void WebViewGuest::DidFailProvisionalLoad(
     content::RenderFrameHost* render_frame_host,
     const GURL& validated_url,
     int error_code,
     const base::string16& error_description,
     bool was_ignored_by_handler) {
+  // Suppress loadabort for "mailto" URLs.
+  if (validated_url.SchemeIs("mailto"))

[lazyboy, 2015/07/13 20:27:28]

url::kMailToScheme

+    return;
+
   LoadAbort(!render_frame_host->GetParent(), validated_url, error_code,
             net::ErrorToShortString(error_code));
 }
 
 void WebViewGuest::DidStartProvisionalLoadForFrame(
     content::RenderFrameHost* render_frame_host,
     const GURL& validated_url,
     bool is_error_page,
     bool is_iframe_srcdoc) {
   scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
@@ skipping 634 matching lines @@
     scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
     DispatchEventToView(
         new GuestViewEvent(webview::kEventExitFullscreen, args.Pass()));
   }
   // Since we changed fullscreen state, sending a Resize message ensures that
   // renderer/ sees the change.
   web_contents()->GetRenderViewHost()->WasResized();
 }
 
 }  // namespace extensions