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

content/browser/renderer_host/media/webrtc_identity_service_host.cc

 // Copyright 2013 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/media/webrtc_identity_service_host.h"
 
 #include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/media/webrtc_identity_store.h"
 #include "content/common/media/webrtc_identity_messages.h"
 #include "net/base/net_errors.h"
 
 namespace content {
 
 WebRTCIdentityServiceHost::WebRTCIdentityServiceHost(
     int renderer_process_id,
     scoped_refptr<WebRTCIdentityStore> identity_store)
-    : BrowserMessageFilter(WebRTCIdentityMsgStart),
-      renderer_process_id_(renderer_process_id),
+    : renderer_process_id_(renderer_process_id),
       identity_store_(identity_store),
       weak_factory_(this) {}
 
 WebRTCIdentityServiceHost::~WebRTCIdentityServiceHost() {
   if (!cancel_callback_.is_null())
     cancel_callback_.Run();
 }
 
 bool WebRTCIdentityServiceHost::OnMessageReceived(const IPC::Message& message,
                                                 bool* message_was_ok) {
@@ skipping 57 matching lines @@
     SendErrorMessage(sequence_number, status);
   }
 }
 
 void WebRTCIdentityServiceHost::SendErrorMessage(int sequence_number,
                                                  int error) {
   Send(new WebRTCIdentityHostMsg_RequestFailed(sequence_number, error));
 }
 
 }  // namespace content