Remove obsolete code

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 938 matching lines @@
 IPC_MESSAGE_ROUTED3(ViewMsg_Find,
                     int /* request_id */,
                     string16 /* search_text */,
                     WebKit::WebFindOptions)
 
 // This message notifies the renderer that the user has closed the FindInPage
 // window (and what action to take regarding the selection).
 IPC_MESSAGE_ROUTED1(ViewMsg_StopFinding,
                     content::StopFindAction /* action */)
 
-// Used to notify the render-view that the browser has received a reply for
-// the Find operation and is interested in receiving the next one. This is
-// used to prevent the renderer from spamming the browser process with
-// results.
-IPC_MESSAGE_ROUTED0(ViewMsg_FindReplyACK)
-
 // These messages are typically generated from context menus and request the
 // renderer to apply the specified operation to the current selection.
 IPC_MESSAGE_ROUTED0(ViewMsg_Undo)
 IPC_MESSAGE_ROUTED0(ViewMsg_Redo)
 IPC_MESSAGE_ROUTED0(ViewMsg_Cut)
 IPC_MESSAGE_ROUTED0(ViewMsg_Copy)
 #if defined(OS_MACOSX)
 IPC_MESSAGE_ROUTED0(ViewMsg_CopyToFindPboard)
 #endif
 IPC_MESSAGE_ROUTED0(ViewMsg_Paste)
@@ skipping 1201 matching lines @@
 // (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 */)
 
 // Screen was rotated. Dispatched to the onorientationchange javascript API.
 IPC_MESSAGE_ROUTED1(ViewMsg_OrientationChangeEvent,
                     int /* orientation */)