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AppList will be available only with Ash.

Some mac machines still have apps shortcut in the dock, and Apple do not
have an API to remove things from the Dock. This commit hard codes the
shim handler into AppShimHandler so that we can clean up AppListService
classes.

This commit:
- moves InitAppsPageLegacyShimHandler for mac out of AppListService;
- removes references to AppListService from mac.

Bug: 733662
Change-Id: I66bca8851bf2427a5cd16f3046680e304d1ee368
Reviewed-on: https://chromium-review.googlesource.com/963684Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Jiaquan He <hejq@google.com>
Cr-Commit-Position: refs/heads/master@{#543863}