CL at https://chromium-review.googlesource.com/c/chromium/src/+/755481

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/978f3c4fb8e40a697b9d83736f127287114f9af2

commit 978f3c4fb8e40a697b9d83736f127287114f9af2
Author: Dave Schuyler <dschuyler@chromium.org>
Date: Tue Nov 07 03:30:19 2017

[MD extensions] improve error selection and expand/collapse

This CL improves the error selection and expand/collapse functionality.
Though there are further improvements I intend to make, this is a step
forward.

Bug:  781927 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: If223f1d80ee5d92dee0f8a53be31f2806424d26d
Reviewed-on: https://chromium-review.googlesource.com/755481
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#514375}
[modify] https://crrev.com/978f3c4fb8e40a697b9d83736f127287114f9af2/chrome/browser/resources/md_extensions/error_page.html
[modify] https://crrev.com/978f3c4fb8e40a697b9d83736f127287114f9af2/chrome/browser/resources/md_extensions/error_page.js

Created  issue 782340  to follow up on further improvement ideas.

dschuyler@ Can you please provide the steps to verify this issue at TE end.

Thanks...

@ #4, It is confusing. For that reason this UI is changing again. Please see  Issue 782340 . I've written a description of how that UI will work. That change should land soon. Testing the fix in that Issue should cover both of these issues imo.