Revert of Remove about:srcdoc url conversion.

chrome/browser/ui/webui/settings/md_settings_ui.cc

 // Copyright 2015 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/ui/webui/settings/md_settings_ui.h"
 
 #include <stddef.h>
 
 #include <string>
 
@@ skipping 147 matching lines @@
 
 void MdSettingsUI::AddSettingsPageUIHandler(SettingsPageUIHandler* handler) {
   DCHECK(handler);
   handlers_.insert(handler);
   web_ui()->AddMessageHandler(handler);  // |handler| is owned by |web_ui()|.
 }
 
 void MdSettingsUI::DidStartProvisionalLoadForFrame(
     content::RenderFrameHost* render_frame_host,
     const GURL& validated_url,
-    bool is_error_page) {
+    bool is_error_page,
+    bool is_iframe_srcdoc) {
   load_start_time_ = base::Time::Now();
 }
 
 void MdSettingsUI::DocumentLoadedInFrame(
     content::RenderFrameHost* render_frame_host) {
   UMA_HISTOGRAM_TIMES("Settings.LoadDocumentTime.MD",
                       base::Time::Now() - load_start_time_);
 }
 
 void MdSettingsUI::DocumentOnLoadCompletedInMainFrame() {
   UMA_HISTOGRAM_TIMES("Settings.LoadCompletedTime.MD",
                       base::Time::Now() - load_start_time_);
 }
 
 }  // namespace settings