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

chrome/common/extensions/extension_messages.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.
 
 // IPC messages for extensions.
 // Multiply-included message file, hence no include guard.
 
 #include "base/shared_memory.h"
 #include "base/values.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_permission_set.h"
 #include "chrome/common/extensions/url_pattern.h"
 #include "chrome/common/extensions/url_pattern_set.h"
 #include "chrome/common/web_apps.h"
-#include "content/public/common/view_types.h"
+#include "content/public/common/view_type.h"
 #include "ipc/ipc_message_macros.h"
 
 #define IPC_MESSAGE_START ExtensionMsgStart
 
 // Parameters structure for ExtensionHostMsg_Request.
 IPC_STRUCT_BEGIN(ExtensionHostMsg_Request_Params)
   // Message name.
   IPC_STRUCT_MEMBER(std::string, name)
 
   // List of message arguments.
@@ skipping 338 matching lines @@
 // Response to the renderer for the above message.
 IPC_MESSAGE_ROUTED3(ExtensionMsg_GetAppNotifyChannelResponse,
                     std::string /* channel_id */,
                     std::string /* error */,
                     int32 /* callback_id */)
 
 // Deliver a message sent with ExtensionHostMsg_PostMessage.
 IPC_MESSAGE_ROUTED2(ExtensionMsg_DeliverMessage,
                     int /* target_port_id */,
                     std::string /* message */)