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Most of these were referenced by Cocoa code that has now been deleted.

Bug: 832676
Change-Id: I96a54b283912b30455de753d2a689db464c35e64
Reviewed-on: https://chromium-review.googlesource.com/1246865
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594513}