Revert of Remove about:srcdoc url conversion.

content/browser/web_contents/web_contents_impl_browsertest.cc

Index: content/browser/web_contents/web_contents_impl_browsertest.cc
diff --git a/content/browser/web_contents/web_contents_impl_browsertest.cc b/content/browser/web_contents/web_contents_impl_browsertest.cc
index bcb9a6facc837a2f631cc43254f9dfea4b159a9a..28a1ab37940c517c1c9d9dbc01674bec55a3cd78 100644
--- a/content/browser/web_contents/web_contents_impl_browsertest.cc
+++ b/content/browser/web_contents/web_contents_impl_browsertest.cc
@@ -158,9 +158,11 @@
     rwhv_create_size_ = rvh->GetWidget()->GetView()->GetViewBounds().size();
   }
 
-  void DidStartProvisionalLoadForFrame(RenderFrameHost* render_frame_host,
-                                       const GURL& url,
-                                       bool is_error_page) override {
+  void DidStartProvisionalLoadForFrame(
+      RenderFrameHost* render_frame_host,
+      const GURL& url,
+      bool is_error_page,
+      bool is_iframe_srcdoc) override {
     ResizeWebContentsView(shell_, wcv_new_size_, false);
   }