Remove DCHECK that crashes.

content/renderer/render_frame_impl.cc

Index: content/renderer/render_frame_impl.cc
diff --git a/content/renderer/render_frame_impl.cc b/content/renderer/render_frame_impl.cc
index ff488741db1997fee661106571a7f1408ec9f566..024aafb42713915c2e36f0c8ec7cceac3e72b110 100644
--- a/content/renderer/render_frame_impl.cc
+++ b/content/renderer/render_frame_impl.cc
@@ -4279,9 +4279,8 @@ bool RenderFrameImpl::RunModalBeforeUnloadDialog(bool is_reload) {
   // This is an ignored return value, but is included so we can accept the same
   // response as RunJavaScriptDialog.
   base::string16 ignored_result;
-  Send(new FrameHostMsg_RunBeforeUnloadConfirm(
-      routing_id_, frame_->GetDocument().Url(), is_reload, &success,
-      &ignored_result));
+  Send(new FrameHostMsg_RunBeforeUnloadConfirm(routing_id_, is_reload, &success,
+                                               &ignored_result));
   return success;
 }