Move view_types.h to view_type.h, since that's the standard name for enums.

chrome/common/chrome_view_type.h

 // Copyright (c) 2011 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 CHROME_COMMON_CHROME_VIEW_TYPES_H_
-#define CHROME_COMMON_CHROME_VIEW_TYPES_H_
+#ifndef CHROME_COMMON_CHROME_VIEW_TYPE_H_
+#define CHROME_COMMON_CHROME_VIEW_TYPE_H_
 #pragma once
 
-#include "content/public/common/view_types.h"
+#include "content/public/common/view_type.h"
 
 namespace chrome {
 
 // Indicates different types of views.
 enum ViewType {
   VIEW_TYPE_CHROME_START = content::VIEW_TYPE_CONTENT_END,
 
   VIEW_TYPE_BACKGROUND_CONTENTS,
   VIEW_TYPE_EXTENSION_BACKGROUND_PAGE,
   VIEW_TYPE_EXTENSION_POPUP,
   VIEW_TYPE_EXTENSION_INFOBAR,
   VIEW_TYPE_NOTIFICATION,
   VIEW_TYPE_EXTENSION_DIALOG,
 };
 
 // Constant strings corresponding to the Type enumeration values.  Used
 // when converting JS arguments.
 extern const char kViewTypeTabContents[];
 extern const char kViewTypeBackgroundPage[];
 extern const char kViewTypePopup[];
 extern const char kViewTypeInfobar[];
 extern const char kViewTypeNotification[];
 extern const char kViewTypeExtensionDialog[];
 extern const char kViewTypeAll[];
 
 }  // namespace chrome
 
-#endif  // CHROME_COMMON_CHROME_VIEW_TYPES_H_
+#endif  // CHROME_COMMON_CHROME_VIEW_TYPE_H_