(Reland) 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 cfdd32db8acb5b0bf01b7fa280952e70a5230739..b9d3d6eebc61858cd7bedeea53d9feabcb64dbf0 100644
--- a/content/browser/frame_host/navigation_request.cc
+++ b/content/browser/frame_host/navigation_request.cc
@@ -302,11 +302,10 @@ void NavigationRequest::BeginNavigation() {
 
 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 and is_srcdoc.
+  // proper values are specified for is_same_page.
   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,
       common_params_.gesture,
       false);  // started_in_context_menu