Remove extension automation support that was used only by CEEE.

chrome/browser/automation/extension_automation_constants.cc

Index: chrome/browser/automation/extension_automation_constants.cc
diff --git a/chrome/browser/automation/extension_automation_constants.cc b/chrome/browser/automation/extension_automation_constants.cc
deleted file mode 100644
index c4e6fce944e58b925710db711d4c10af597f32da..0000000000000000000000000000000000000000
--- a/chrome/browser/automation/extension_automation_constants.cc
+++ /dev/null
@@ -1,32 +0,0 @@
-// Copyright (c) 2010 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 "chrome/browser/automation/extension_automation_constants.h"
-
-namespace extension_automation_constants {
-
-const char kAutomationOrigin[] = "__priv_xtapi";
-const char kAutomationRequestIdKey[] = "rqid";
-
-const char kAutomationHasCallbackKey[] = "hascb";
-const char kAutomationErrorKey[] = "err";
-const char kAutomationNameKey[] = "name";
-const char kAutomationArgsKey[] = "args";
-const char kAutomationResponseKey[] = "res";
-const char kAutomationRequestTarget[] = "__priv_xtreq";
-const char kAutomationResponseTarget[] = "__priv_xtres";
-
-const char kAutomationConnectionIdKey[] = "connid";
-const char kAutomationMessageDataKey[] = "data";
-const char kAutomationExtensionIdKey[] = "extid";
-const char kAutomationPortIdKey[] = "portid";
-const char kAutomationChannelNameKey[] = "chname";
-const char kAutomationTabJsonKey[] = "tab";
-
-const char kAutomationPortRequestTarget[] = "__priv_prtreq";
-const char kAutomationPortResponseTarget[] = "__priv_prtres";
-
-const char kAutomationBrowserEventRequestTarget[] = "__priv_evtreq";
-
-}  // namespace extension_automation_constants