Revert of Remove about:srcdoc url conversion.

content/browser/frame_host/navigation_request.cc

Index: content/browser/frame_host/navigation_request.cc
diff --git a/content/browser/frame_host/navigation_request.cc b/content/browser/frame_host/navigation_request.cc
index 27363547576faa6dbbcd6f11de6d4cdf8e6b24c5..4c24485495582a9779114f52df872e9a33ff8b8c 100644
--- a/content/browser/frame_host/navigation_request.cc
+++ b/content/browser/frame_host/navigation_request.cc
@@ -304,10 +304,11 @@
 
 void NavigationRequest::CreateNavigationHandle(int pending_nav_entry_id) {
   // TODO(nasko): Update the NavigationHandle creation to ensure that the
-  // proper values are specified for is_same_page.
+  // proper values are specified for is_same_page and is_srcdoc.
   navigation_handle_ = NavigationHandleImpl::Create(
       common_params_.url, frame_tree_node_, !browser_initiated_,
       false,  // is_same_page
+      false,  // is_srcdoc
       common_params_.navigation_start, pending_nav_entry_id,
       false);  // started_in_context_menu