Revert of Remove about:srcdoc url conversion.

content/public/test/test_navigation_observer.cc

Index: content/public/test/test_navigation_observer.cc
diff --git a/content/public/test/test_navigation_observer.cc b/content/public/test/test_navigation_observer.cc
index 6f48b2f23f9978b47b2f4e615bb6f83988874b17..684c66f91e9f5894967aa76c8f236f59b0a76e4a 100644
--- a/content/public/test/test_navigation_observer.cc
+++ b/content/public/test/test_navigation_observer.cc
@@ -49,9 +49,10 @@
 
   void DidStartProvisionalLoadForFrame(RenderFrameHost* render_frame_host,
                                        const GURL& validated_url,
-                                       bool is_error_page) override {
+                                       bool is_error_page,
+                                       bool is_iframe_srcdoc) override {
     parent_->OnDidStartProvisionalLoad(render_frame_host, validated_url,
-                                       is_error_page);
+                                       is_error_page, is_iframe_srcdoc);
   }
 
   void DidFailProvisionalLoad(
@@ -175,7 +176,8 @@
 void TestNavigationObserver::OnDidStartProvisionalLoad(
     RenderFrameHost* render_frame_host,
     const GURL& validated_url,
-    bool is_error_page) {
+    bool is_error_page,
+    bool is_iframe_srcdoc) {
   last_navigation_succeeded_ = false;
 }