This patch enables "mailto" links in WebViews.

extensions/browser/guest_view/web_view/web_view_guest.cc

Index: extensions/browser/guest_view/web_view/web_view_guest.cc
diff --git a/extensions/browser/guest_view/web_view/web_view_guest.cc b/extensions/browser/guest_view/web_view/web_view_guest.cc
index 4ab87e29426112000e3b53cca869d2c0771705d8..cee7c1491675f0c34391f5ab5d540067472a3cd9 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest.cc
+++ b/extensions/browser/guest_view/web_view/web_view_guest.cc
@@ -797,6 +797,10 @@ void WebViewGuest::DidFailProvisionalLoad(
     int error_code,
     const base::string16& error_description,
     bool was_ignored_by_handler) {
+  // Suppress loadabort for "mailto" URLs.
+  if (validated_url.SchemeIs(url::kMailToScheme))
+    return;
+
   LoadAbort(!render_frame_host->GetParent(), validated_url, error_code,
             net::ErrorToShortString(error_code));
 }