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 1a174895c469183cfe99c72ab5239309dae2c3b4..f160398f34e834bb0f6d345a623342752d3c8a78 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());
   }