Revert "Allow MessageFilters to restrict listening to specific message classes"

content/browser/renderer_host/text_input_client_message_filter.mm

 // 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.
 
 #include "content/browser/renderer_host/text_input_client_message_filter.h"
 
 #include "base/strings/string16.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/text_input_client_mac.h"
 #include "content/common/text_input_client_messages.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "ipc/ipc_message_macros.h"
 #include "ui/gfx/range/range.h"
 #include "ui/gfx/rect.h"
 
 namespace content {
 
 TextInputClientMessageFilter::TextInputClientMessageFilter(int child_id)
-    : BrowserMessageFilter(TextInputClientMsgStart),
+    : BrowserMessageFilter(),
       child_process_id_(child_id) {
 }
 
 bool TextInputClientMessageFilter::OnMessageReceived(
     const IPC::Message& message,
     bool* message_was_ok) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(TextInputClientMessageFilter, message,
       *message_was_ok)
     IPC_MESSAGE_HANDLER(TextInputClientReplyMsg_GotCharacterIndexForPoint,
@@ skipping 29 matching lines @@
     const mac::AttributedStringCoder::EncodedString& encoded_string) {
   TextInputClientMac* service = TextInputClientMac::GetInstance();
   NSAttributedString* string =
       mac::AttributedStringCoder::Decode(&encoded_string);
   if (![string length])
     string = nil;
   service->SetSubstringAndSignal(string);
 }
 
 }  // namespace content