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Screenshots:
 - Diagnostics Page (before) http://shortn/_h8KubnXkcH
 - Diagnostics Page (after) http://shortn/_PLo7f0AOfM

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: I40c8d6cccc9e42457047f9dd79f74ab568e91596
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2426967
Commit-Queue: Michael Checo <michaelcheco@google.com>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811022}