Move the ViewType enum to extensions\common.

chrome/common/view_type.cc

Index: chrome/common/view_type.cc
===================================================================
--- chrome/common/view_type.cc	(revision 191609)
+++ chrome/common/view_type.cc	(working copy)
@@ -1,19 +0,0 @@
-// 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.
-
-#include "chrome/common/view_type.h"
-
-namespace chrome {
-
-const char kViewTypeTabContents[] = "TAB";
-const char kViewTypeBackgroundPage[] = "BACKGROUND";
-const char kViewTypePopup[] = "POPUP";
-const char kViewTypePanel[] = "PANEL";
-const char kViewTypeInfobar[] = "INFOBAR";
-const char kViewTypeNotification[] = "NOTIFICATION";
-const char kViewTypeExtensionDialog[] = "EXTENSION_DIALOG";
-const char kViewTypeAppShell[] = "SHELL";
-const char kViewTypeAll[] = "ALL";
-
-}  // namespace chrome