Move DBMessageFilter to content/child since its only used in child ptypes

content/common/db_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/common/db_message_filter.h"
-
-#include "content/common/database_messages.h"
-#include "third_party/WebKit/public/platform/WebString.h"
-#include "third_party/WebKit/public/web/WebDatabase.h"
-
-using WebKit::WebString;
-
-namespace content {
-
-DBMessageFilter::DBMessageFilter() {
-}
-
-bool DBMessageFilter::OnMessageReceived(const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(DBMessageFilter, message)
-    IPC_MESSAGE_HANDLER(DatabaseMsg_UpdateSize, OnDatabaseUpdateSize)
-    IPC_MESSAGE_HANDLER(DatabaseMsg_UpdateSpaceAvailable,
-                        OnDatabaseUpdateSpaceAvailable)
-    IPC_MESSAGE_HANDLER(DatabaseMsg_ResetSpaceAvailable,
-                        OnDatabaseResetSpaceAvailable)
-    IPC_MESSAGE_HANDLER(DatabaseMsg_CloseImmediately,
-                        OnDatabaseCloseImmediately)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
-void DBMessageFilter::OnDatabaseUpdateSize(const std::string& origin_identifier,
-                                           const string16& database_name,
-                                           int64 database_size) {
-  WebKit::WebDatabase::updateDatabaseSize(
-      WebString::fromUTF8(origin_identifier), database_name, database_size);
-}
-
-void DBMessageFilter::OnDatabaseUpdateSpaceAvailable(
-    const std::string& origin_identifier,
-    int64 space_available) {
-  WebKit::WebDatabase::updateSpaceAvailable(
-      WebString::fromUTF8(origin_identifier), space_available);
-}
-
-void DBMessageFilter::OnDatabaseResetSpaceAvailable(
-    const std::string& origin_identifier) {
-  WebKit::WebDatabase::resetSpaceAvailable(
-      WebString::fromUTF8(origin_identifier));
-}
-
-void DBMessageFilter::OnDatabaseCloseImmediately(
-    const std::string& origin_identifier,
-    const string16& database_name) {
-  WebKit::WebDatabase::closeDatabaseImmediately(
-      WebString::fromUTF8(origin_identifier), database_name);
-}
-
-}  // namespace content