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See attached issue. Accessibility users can now tab through the
dialog, getting specific information (such as permissions), with the
screen reader reading each element.

A new subclass of Label has been created to ensure that non-
accessible users can get visual feedback if they use TAB to traverse
the dialog, since normal labels do not paint a text focus ring when
focused.

Future work:
 - Eliminate AppInfoPanel::CreateKeyValueField()
 - Merge AppInfoLabel functionality into views::Label

Bug: 996764
Change-Id: I97655c925c02b7d0b943f7fbb916ec1a87eed175
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1910871Reviewed-by: Caroline Rising <corising@chromium.org>
Commit-Queue: Dana Fried <dfried@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715054}