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Screenshots:
- Diagnostics App (before) http://shortn/_yLwB4ZAKfO
- Diagnostics App (after) http://shortn/_u5OBuBN0Bm

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: I688332b4ee48867be5b20e9ee0834914f0f6e0f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440927Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Michael Checo <michaelcheco@google.com>
Cr-Commit-Position: refs/heads/master@{#812673}