Revert of Remove about:srcdoc url conversion.

chrome/browser/ui/webui/options/options_ui.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_OPTIONS_OPTIONS_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_OPTIONS_UI_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 114 matching lines @@
   // Takes the suggestions from |result| and adds them to |suggestions| so that
   // they can be passed to a JavaScript function.
   static void ProcessAutocompleteSuggestions(
       const AutocompleteResult& result,
       base::ListValue* const suggestions);
 
   // Overridden from content::WebContentsObserver:
   void DidStartProvisionalLoadForFrame(
       content::RenderFrameHost* render_frame_host,
       const GURL& validated_url,
-      bool is_error_page) override;
+      bool is_error_page,
+      bool is_iframe_srcdoc) override;
   void DocumentLoadedInFrame(
       content::RenderFrameHost *render_frame_host) override;
   void DocumentOnLoadCompletedInMainFrame() override;
 
   // Overridden from OptionsPageUIHandlerHost:
   void InitializeHandlers() override;
   void OnFinishedLoading() override;
 
  private:
   // Adds OptionsPageUiHandler to the handlers list if handler is enabled.
@@ skipping 11 matching lines @@
 #endif
 
   base::Time load_start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(OptionsUI);
 };
 
 }  // namespace options
 
 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_OPTIONS_UI_H_