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Screenshots:
 - Diagnostics Page (before) http://shortn/_khK2BurTJp
 - Diagnostics Page (after) http://shortn/_vc4huCgyEv

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: I885c8bc77f78bf242ae46b9c8b34121fc17b9980
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424823
Commit-Queue: Michael Checo <michaelcheco@google.com>
Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809503}