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

content/browser/renderer_host/pepper/pepper_message_filter.cc

 // 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/pepper/pepper_message_filter.h"
 
 #include "base/logging.h"
 #include "content/browser/renderer_host/pepper/pepper_socket_utils.h"
 #include "content/public/common/content_client.h"
 #include "ppapi/proxy/ppapi_messages.h"
 
 namespace content {
 
-PepperMessageFilter::PepperMessageFilter()
-    : BrowserMessageFilter(PpapiMsgStart) {}
-
+PepperMessageFilter::PepperMessageFilter() {}
 PepperMessageFilter::~PepperMessageFilter() {}
 
 bool PepperMessageFilter::OnMessageReceived(const IPC::Message& msg,
                                             bool* message_was_ok) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(PepperMessageFilter, msg, *message_was_ok)
     // X509 certificate messages.
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBX509Certificate_ParseDER,
                         OnX509CertificateParseDER);
 
   IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP_EX()
   return handled;
 }
 
 void PepperMessageFilter::OnX509CertificateParseDER(
     const std::vector<char>& der,
     bool* succeeded,
     ppapi::PPB_X509Certificate_Fields* result) {
   *succeeded = (der.size() != 0 && pepper_socket_utils::GetCertificateFields(
       &der[0], der.size(), result));
 }
 
 }  // namespace content