Move message handlers that don't belong in RenderProcessHostImpl to their own files.

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 "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/content_export.h"
@@ skipping 1772 matching lines @@
                            string16  /* in - alert message */,
                            bool      /* in - is a reload */,
                            bool      /* out - success */,
                            string16  /* out - This is ignored.*/)
 
 // Sent when the renderer process is done processing a DataReceived
 // message.
 IPC_MESSAGE_ROUTED1(ViewHostMsg_DataReceived_ACK,
                     int /* request_id */)
 
-IPC_MESSAGE_CONTROL1(ViewHostMsg_RevealFolderInOS,
-                     FilePath /* path */)
-
 // Sent when a provisional load on the main frame redirects.
 IPC_MESSAGE_ROUTED4(ViewHostMsg_DidRedirectProvisionalLoad,
                     int /* page_id */,
                     GURL /* opener url if present, else empty */,
                     GURL /* last url */,
                     GURL /* url redirected to */)
 
 // Sent when the renderer changes the zoom level for a particular url, so the
 // browser can update its records.  If remember is true, then url is used to
 // update the zoom level for all pages in that site.  Otherwise, the render
@@ skipping 207 matching lines @@
                     int  /* automation_id */)
 
 // Sent to the browser when the renderer detects it is blocked on a pepper
 // plugin message for too long. This is also sent when it becomes unhung
 // (according to the value of is_hung). The browser can give the user the
 // option of killing the plugin.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_PepperPluginHung,
                     int /* plugin_child_id */,
                     FilePath /* path */,
                     bool /* is_hung */)