Revert of Add RoutingIDIssuer to help track routing id issues.

content/public/test/routing_id_mangling_disabler.cc

Index: content/public/test/routing_id_mangling_disabler.cc
diff --git a/content/public/test/routing_id_mangling_disabler.cc b/content/public/test/routing_id_mangling_disabler.cc
deleted file mode 100644
index b1e83a127a15fdf73ab8ea423423bb68767afef7..0000000000000000000000000000000000000000
--- a/content/public/test/routing_id_mangling_disabler.cc
+++ /dev/null
@@ -1,19 +0,0 @@
-// 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 "content/public/test/routing_id_mangling_disabler.h"
-
-#include "content/browser/renderer_host/routing_id_issuer.h"
-
-namespace content {
-
-RoutingIDManglingDisabler::RoutingIDManglingDisabler() {
-  RoutingIDIssuer::DisableIDMangling();
-}
-
-RoutingIDManglingDisabler::~RoutingIDManglingDisabler() {
-  RoutingIDIssuer::EnableIDMangling();
-}
-
-}  // namespace content