Update component updater URLs.

components/component_updater/component_updater_url_constants.cc

 // Copyright 2015 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 "components/component_updater/component_updater_url_constants.h"
 
 namespace component_updater {
 
 // The default URL for the v3 protocol service endpoint. In some cases, the
 // component updater is allowed to fall back to other URL endpoints, if
 // the request to the default URL source fails.
 //
 // The responses to the requests made to these endpoints are always signed.
 //
 // The value of |kDefaultUrlSource| can be overridden with
 // --component-updater=url-source=someurl.
 const char kUpdaterDefaultUrl[] = "https://clients2.google.com/service/update2";
 
 const char kUpdaterFallbackUrl[] = "http://clients2.google.com/service/update2";
 
+const char kUpdaterDefaultUrlAlt[] =

[rkaplow, 2017/01/27 17:28:38]

nit, I'd call it it AltUrl so it ends with Url but maybe that's just me

[waffles, 2017/01/27 18:14:36]

I see the point but I have a preference to just add a suffix; makes it easier to
search. Let me know if you feel strongly.

+    "https://update.googleapis.com/service/update2";
+
+const char kUpdaterFallbackUrlAlt[] =
+    "http://update.googleapis.com/service/update2";
 }  // namespace component_updater