The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/708150fa6719a691befd72702ac6d5221db6d853

commit 708150fa6719a691befd72702ac6d5221db6d853
Author: rdevlin.cronin <rdevlin.cronin@chromium.org>
Date: Mon Feb 06 23:57:36 2017

[Extensions UI Mac] Update external install prompt strings to titlecase

Mac uses title case for buttons. Update the external install prompt
strings to use title case.

BUG=669277
BUG= 689227 

Review-Url: https://codereview.chromium.org/2680613002
Cr-Commit-Position: refs/heads/master@{#448448}

[modify] https://crrev.com/708150fa6719a691befd72702ac6d5221db6d853/chrome/app/generated_resources.grd

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c7f8d139f448266d41723a8fba0347a246111c03

commit c7f8d139f448266d41723a8fba0347a246111c03
Author: rdevlin.cronin <rdevlin.cronin@chromium.org>
Date: Wed Feb 22 14:29:02 2017

[Extensions] Deprecate old install prompt types

Remove old install prompt types from the code. Because the enum is used
in histograms, this isn't removed completely, but we can comment them
out to make sure they aren't used.

Also move away from using the "array of messages" approach, because this
required padding with 0's for deprecated types, and was significantly
harder to read.

Finally, remove a few deprecated messages that were found by doing this.

BUG= 689227 

Review-Url: https://codereview.chromium.org/2705733002
Cr-Commit-Position: refs/heads/master@{#452038}

[modify] https://crrev.com/c7f8d139f448266d41723a8fba0347a246111c03/chrome/app/generated_resources.grd
[modify] https://crrev.com/c7f8d139f448266d41723a8fba0347a246111c03/chrome/browser/extensions/extension_install_prompt.cc
[modify] https://crrev.com/c7f8d139f448266d41723a8fba0347a246111c03/chrome/browser/extensions/extension_install_prompt.h

Archiving old bugs that have only received trivial updates for some time.

If you feel this issue should still be addressed, feel free to reopen it or to file a new issue. Thanks!

This was actually fixed with #1, and just never closed out.  Updating status.