Simplify WebUI data sources. Currently WebUI data sources implement a URLDataSourceDelegate interfa…

content/public/browser/url_data_source_delegate.cc

-// Copyright (c) 2013 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/public/browser/url_data_source_delegate.h"
-
-#include "content/public/browser/browser_thread.h"
-
-namespace content {
-
-URLDataSourceDelegate::URLDataSourceDelegate()
-    : url_data_source_(NULL) {
-}
-
-URLDataSourceDelegate::~URLDataSourceDelegate() {
-}
-
-MessageLoop* URLDataSourceDelegate::MessageLoopForRequestPath(
-    const std::string& path) const {
-  return BrowserThread::UnsafeGetMessageLoopForThread(BrowserThread::UI);
-}
-
-bool URLDataSourceDelegate::ShouldReplaceExistingSource() const {
-  return true;
-}
-
-bool URLDataSourceDelegate::AllowCaching() const {
-  return true;
-}
-
-}  // namespace content