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Extensions used to be able to override the bookmark star view in order
to provide a custom bookmark manager (this was used for the Stars
extension). The extension has been deprecated and removed, and the API
never launched. Clean up the remnants.

Remove the logic for the StarView being hidden if there's an overriding
extension installed.

Bug: 894447
Change-Id: I57381c688ddacac747391a9af432e8375e16ca83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2119387Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753797}