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Previously this created an english localization folder and assumed OSX
would use it since it's the only one available. However, when english is
not one of the preferred languages, the metadata for the shim bundle
would report its filename as the display name. The metadata is used by
Spotlight, so the user would be unable to search for the app.
See the bug for more details.

With this CL, we still only create one localization folder, but use the
most preferred language reported by the OS.

This also deletes any existing shims before creating new ones.

BUG=482658

Review URL: https://codereview.chromium.org/1137373003

Cr-Commit-Position: refs/heads/master@{#330038}