Revert of Remove about:srcdoc url conversion.

chrome/browser/ui/webui/extensions/extensions_ui.cc

 // 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.
 
 #include "chrome/browser/ui/webui/extensions/extensions_ui.h"
 
 #include <memory>
 
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 31 matching lines @@
 
 class ExtensionWebUiTimer : public content::WebContentsObserver {
  public:
   explicit ExtensionWebUiTimer(content::WebContents* web_contents, bool is_md)
       : content::WebContentsObserver(web_contents), is_md_(is_md) {}
   ~ExtensionWebUiTimer() override {}
 
   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 {
     timer_.reset(new base::ElapsedTimer());
   }
 
   void DocumentLoadedInFrame(
       content::RenderFrameHost* render_frame_host) override {
     if (render_frame_host != web_contents()->GetMainFrame() ||
         !timer_) {  // See comment in DocumentOnLoadCompletedInMainFrame()
       return;
     }
     if (is_md_) {
@@ skipping 275 matching lines @@
 ExtensionsUI::~ExtensionsUI() {}
 
 // static
 base::RefCountedMemory* ExtensionsUI::GetFaviconResourceBytes(
     ui::ScaleFactor scale_factor) {
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   return rb.LoadDataResourceBytesForScale(IDR_EXTENSIONS_FAVICON, scale_factor);
 }
 
 }  // namespace extensions