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Screenshots:
 - Diagnostics App (before) http://shortn/_UuPjDwlNnn
 - Diagnostics App (after) http://shortn/_4Aem4oahU9

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: Id15c38b3453ca77dabd8e215cd5dbd1d6a94418d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441680Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Michael Checo <michaelcheco@google.com>
Cr-Commit-Position: refs/heads/master@{#814476}