Upstream most of the iOS WebUI support in ios/web/

ios/web/webui/url_data_source_ios.cc

+// Copyright 2014 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 "ios/web/public/url_data_source_ios.h"
+
+#include "ios/web/public/web_client.h"
+#include "ios/web/webui/url_data_manager_ios.h"
+#include "net/url_request/url_request.h"
+
+namespace web {
+
+void URLDataSourceIOS::Add(BrowserState* browser_state,
+                           URLDataSourceIOS* source) {
+  URLDataManagerIOS::AddDataSource(browser_state, source);
+}
+
+bool URLDataSourceIOS::ShouldReplaceExistingSource() const {
+  return true;
+}
+
+bool URLDataSourceIOS::AllowCaching() const {
+  return true;
+}
+
+std::string URLDataSourceIOS::GetContentSecurityPolicyObjectSrc() const {
+  return "object-src 'none';";
+}
+
+bool URLDataSourceIOS::ShouldDenyXFrameOptions() const {
+  return true;
+}
+
+bool URLDataSourceIOS::ShouldServiceRequest(
+    const net::URLRequest* request) const {
+  if (GetWebClient()->IsAppSpecificURL(request->url()))

[Eugene But (OOO till 7-30), 2015/04/28 20:23:01]

NIT:

return GetWebClient()->IsAppSpecificURL(request->url());

+    return true;
+  return false;
+}
+
+}  // namespace web