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

content/browser/renderer_host/database_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/database_message_filter.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/platform_file.h"
@@ skipping 23 matching lines @@
 namespace content {
 namespace {
 
 const int kNumDeleteRetries = 2;
 const int kDelayDeleteRetryMs = 100;
 
 }  // namespace
 
 DatabaseMessageFilter::DatabaseMessageFilter(
     webkit_database::DatabaseTracker* db_tracker)
-    : BrowserMessageFilter(DatabaseMsgStart),
-      db_tracker_(db_tracker),
+    : db_tracker_(db_tracker),
       observer_added_(false) {
   DCHECK(db_tracker_.get());
 }
 
 void DatabaseMessageFilter::OnChannelClosing() {
   if (observer_added_) {
     observer_added_ = false;
     BrowserThread::PostTask(
         BrowserThread::FILE, FROM_HERE,
         base::Bind(&DatabaseMessageFilter::RemoveObserver, this));
@@ skipping 300 matching lines @@
 }
 
 void DatabaseMessageFilter::OnDatabaseScheduledForDeletion(
     const std::string& origin_identifier,
     const base::string16& database_name) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
   Send(new DatabaseMsg_CloseImmediately(origin_identifier, database_name));
 }
 
 }  // namespace content