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

content/browser/renderer_host/file_utilities_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/file_utilities_message_filter.h"
 
 #include "base/file_util.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/common/file_utilities_messages.h"
 
 namespace content {
 
 FileUtilitiesMessageFilter::FileUtilitiesMessageFilter(int process_id)
-    : BrowserMessageFilter(FileUtilitiesMsgStart),
-      process_id_(process_id) {
+    : process_id_(process_id) {
 }
 
 FileUtilitiesMessageFilter::~FileUtilitiesMessageFilter() {
 }
 
 void FileUtilitiesMessageFilter::OverrideThreadForMessage(
     const IPC::Message& message,
     BrowserThread::ID* thread) {
   if (IPC_MESSAGE_CLASS(message) == FileUtilitiesMsgStart)
     *thread = BrowserThread::FILE;
@@ skipping 21 matching lines @@
   if (!ChildProcessSecurityPolicyImpl::GetInstance()->CanReadFile(
       process_id_, path)) {
     return;
   }
 
   if (!base::GetFileInfo(path, result))
     *status = base::File::FILE_ERROR_FAILED;
 }
 
 }  // namespace content