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The "overflow" menu referred to the old extensions toolbar UI; now we
use the terminology of "pinned" and "unpinned". Update a few of these
sites - most notably in the ExtensionContextMenuModel.

Note: This deliberately does not update any references in old UI code,
since those still (conceptually) refer to the overflow menu.

Bug: 1100412
Change-Id: I2d3f968f548f43e9aaa1e4d7fa01b99c1ef4f02c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387137
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803441}