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

content/browser/worker_host/worker_message_filter.cc

 // Copyright (c) 2011 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/worker_host/worker_message_filter.h"
 
 #include "content/browser/message_port_message_filter.h"
 #include "content/browser/worker_host/worker_service_impl.h"
 #include "content/common/view_messages.h"
 #include "content/common/worker_messages.h"
 #include "content/public/browser/resource_context.h"
 
 namespace content {
 
 WorkerMessageFilter::WorkerMessageFilter(
     int render_process_id,
     ResourceContext* resource_context,
     const WorkerStoragePartition& partition,
     MessagePortMessageFilter* message_port_message_filter)
-    : BrowserMessageFilter(ViewMsgStart),
-      render_process_id_(render_process_id),
+    : render_process_id_(render_process_id),
       resource_context_(resource_context),
       partition_(partition),
       message_port_message_filter_(message_port_message_filter) {
   // Note: This constructor is called on both IO or UI thread.
   DCHECK(resource_context);
 }
 
 WorkerMessageFilter::~WorkerMessageFilter() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 }
@@ skipping 35 matching lines @@
 
 void WorkerMessageFilter::OnForwardToWorker(const IPC::Message& message) {
   WorkerServiceImpl::GetInstance()->ForwardToWorker(message, this);
 }
 
 void WorkerMessageFilter::OnDocumentDetached(unsigned long long document_id) {
   WorkerServiceImpl::GetInstance()->DocumentDetached(document_id, this);
 }
 
 }  // namespace content