Add field trial and flag to mark HTTP as non-secure.

tools/gritsettings/resource_ids

 # 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.
 #
 # This file is used to assign starting resource ids for resources and strings
 # used by Chromium.  This is done to ensure that resource ids are unique
 # across all the grd files.  If you are adding a new grd file, please add
 # a new entry to this file.
 #
 # The first entry in the file, SRCDIR, is special: It is a relative path from
@@ skipping 89 matching lines @@
   "chrome/app/google_chrome_strings.grd": {
     "messages": [11500],
   },
   # Leave lots of space for generated_resources since it has most of our
   # strings.
   "chrome/app/generated_resources.grd": {
     "structures": [12000],
     "messages": [12500],
   },
   "content/app/strings/content_strings.grd": {
-    "messages": [18500],
+    "messages": [18600],
   },
   "components/policy/resources/policy_templates.grd": {
     "structures": [20500],
     "messages": [20510],
   },
   "chrome/browser/resources/sync_internals_resources.grd": {
     "includes": [21500],
   },
   "chrome/browser/resources/signin_internals_resources.grd": {
     "includes": [21750],
@@ skipping 120 matching lines @@
   # These files don't need to reserve resource ids, but are listed here so that
   # translation scripts know of their existence.
   "android_webview/java/strings/android_webview_strings.grd": {},
   "chrome/android/java/strings/android_chrome_strings.grd": {},
   "content/public/android/java/strings/android_content_strings.grd": {},
   "ui/accessibility/extensions/strings/accessibility_extensions_strings.grd": {},
   "ui/android/java/strings/android_ui_strings.grd": {},
 
   # Resource ids starting at 31000 are reserved for projects built on Chromium.
 }