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Screenshots:
 - Diagnostics Page (before) http://shortn/_h8KubnXkcH
 - Diagnostics Page (after) http://shortn/_uW8J9zp2i5

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: Ic649e7c4a84f9bdb27f3050aee4e0b821c49c76d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2429823
Commit-Queue: Michael Checo <michaelcheco@google.com>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811060}