(Reland) Remove about:srcdoc url conversion.

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

Index: chrome/browser/ui/webui/extensions/extensions_ui.cc
diff --git a/chrome/browser/ui/webui/extensions/extensions_ui.cc b/chrome/browser/ui/webui/extensions/extensions_ui.cc
index 9f2ccfa4d3e26022ae3cda319731eefe4e768fcd..45bb0a3af25cd7a841a23c6eb73c359ad59e3f08 100644
--- a/chrome/browser/ui/webui/extensions/extensions_ui.cc
+++ b/chrome/browser/ui/webui/extensions/extensions_ui.cc
@@ -49,8 +49,7 @@ class ExtensionWebUiTimer : public content::WebContentsObserver {
   void DidStartProvisionalLoadForFrame(
       content::RenderFrameHost* render_frame_host,
       const GURL& validated_url,
-      bool is_error_page,
-      bool is_iframe_srcdoc) override {
+      bool is_error_page) override {
     timer_.reset(new base::ElapsedTimer());
   }