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- Mocks changed and this functionality is now all combined
  in the battery status card
- This reverts commit a407643d.

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: I0a8f9356039885bba84a2df3a3eb3771893995c2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422818Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809548}