Make EnableViewSourceMode a FrameMsg

content/common/view_messages.h

 // 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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 827 matching lines @@
 // or not.
 IPC_MESSAGE_ROUTED1(ViewMsg_PpapiBrokerPermissionResult,
                     bool /* result */)
 
 // Tells the renderer to empty its plugin list cache, optional reloading
 // pages containing plugins.
 IPC_MESSAGE_CONTROL1(ViewMsg_PurgePluginListCache,
                      bool /* reload_pages */)
 #endif
 
-// Used to instruct the RenderView to go into "view source" mode.
-IPC_MESSAGE_ROUTED0(ViewMsg_EnableViewSourceMode)
-
 // An acknowledge to ViewHostMsg_MultipleTargetsTouched to notify the renderer
 // process to release the magnified image.
 IPC_MESSAGE_ROUTED1(ViewMsg_ReleaseDisambiguationPopupBitmap,
                     cc::SharedBitmapId /* id */)
 
 // Fetches complete rendered content of a web page as plain text.
 IPC_MESSAGE_ROUTED0(ViewMsg_GetRenderedText)
 
 #if defined(OS_MACOSX)
 // Notification of a change in scrollbar appearance and/or behavior.
@@ skipping 452 matching lines @@
 // Instructs the browser to start plugin IME.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_StartPluginIme)
 
 // Receives content of a web page as plain text.
 IPC_MESSAGE_ROUTED1(ViewMsg_GetRenderedTextCompleted, std::string)
 #endif
 
 // Adding a new message? Stick to the sort order above: first platform
 // independent ViewMsg, then ifdefs for platform specific ViewMsg, then platform
 // independent ViewHostMsg, then ifdefs for platform specific ViewHostMsg.