Revert of Add RoutingIDIssuer to help track routing id issues.

content/public/test/routing_id_mangling_disabler.h

Index: content/public/test/routing_id_mangling_disabler.h
diff --git a/content/public/test/routing_id_mangling_disabler.h b/content/public/test/routing_id_mangling_disabler.h
deleted file mode 100644
index 5c23174cfb86eea631a7865d79e194d813364a40..0000000000000000000000000000000000000000
--- a/content/public/test/routing_id_mangling_disabler.h
+++ /dev/null
@@ -1,20 +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.
-
-#ifndef CONTENT_PUBLIC_TEST_ROUTIND_ID_MANGLING_DISABLER_H_
-#define CONTENT_PUBLIC_TEST_ROUTIND_ID_MANGLING_DISABLER_H_
-
-namespace content {
-
-// Some tests unfortunately assume that the routing ID starts from
-// one. This class temporarily satisfies such an assumption.
-class RoutingIDManglingDisabler {
- public:
-  RoutingIDManglingDisabler();
-  ~RoutingIDManglingDisabler();
-};
-
-}  // namespace content
-
-#endif  // CONTENT_PUBLIC_TEST_ROUTIND_ID_MANGLING_DISABLER_H_