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

chrome/browser/printing/printing_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 "chrome/browser/printing/printing_message_filter.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 72 matching lines @@
   params->should_print_backgrounds = settings.should_print_backgrounds();
   params->display_header_footer = settings.display_header_footer();
   params->title = settings.title();
   params->url = settings.url();
 }
 
 }  // namespace
 
 PrintingMessageFilter::PrintingMessageFilter(int render_process_id,
                                              Profile* profile)
-    : BrowserMessageFilter(PrintMsgStart),
-      profile_io_data_(ProfileIOData::FromResourceContext(
+    : profile_io_data_(ProfileIOData::FromResourceContext(
           profile->GetResourceContext())),
       render_process_id_(render_process_id),
       queue_(g_browser_process->print_job_manager()->queue()) {
   DCHECK(queue_);
 }
 
 PrintingMessageFilter::~PrintingMessageFilter() {
 }
 
 void PrintingMessageFilter::OverrideThreadForMessage(
@@ skipping 367 matching lines @@
 
 #if defined(ENABLE_FULL_PRINTING)
 void PrintingMessageFilter::OnCheckForCancel(int32 preview_ui_id,
                                              int preview_request_id,
                                              bool* cancel) {
   PrintPreviewUI::GetCurrentPrintPreviewStatus(preview_ui_id,
                                                preview_request_id,
                                                cancel);
 }
 #endif