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Screenshots:
- Diagnostics App (before) http://shortn/_9PftSxKEqe
- Diagnostics App (after) http://shortn/_PIhlqmECzl

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: I32bee1b48287b83153f1c3d1b43285ccf7779db3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443109
Commit-Queue: Michael Checo <michaelcheco@google.com>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813818}