Add a check for FrameNavigationEntry in NavigationRequest creation

This CL adds a temporary check in

that we have a valid FrameNavigationEntry.

NavigationControllerImpl: :CreateNavigationRequestFromLoadParams to check
Bug: 896028, 877654
Change-Id: Iaaf20e3eeb98e4ce284fa6a18a9a75d7d8016c79
Reviewed-on: https://chromium-review.googlesource.com/c/1322875
Commit-Queue: Camille Lamy <clamy@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606058}

content/browser/frame_host/navigation_controller_impl.cc

@@ -2734,6 +2734,10 @@ NavigationControllerImpl::CreateNavigationRequestFromLoadParams(
     const NavigationEntryImpl& entry,
     FrameNavigationEntry* frame_entry) {
   DCHECK_EQ(-1, GetIndexOfEntry(&entry));
+  // TODO(https://crbug.com/896028): Turn this CHECK into a DCHECK once the bug
+  // is fixed.
+  CHECK(frame_entry);
+
   GURL url_to_load;
   GURL virtual_url;
   // For main frames, rewrite the URL if necessary and compute the virtual URL