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Do not let ash connect to chrome to get the presenter.

Expose mojom::AppList interface in ash to set the presenter.
Chrome's AppListPresenterService connects to register.
Move instance from Chrome's FactoryImpl to AppListServiceAsh.

Implement app_list::AppList; owned by ash::WmShell.

Add export info to app_list's 'presenter' component.
(lets it add the mojom as a public DEPS; thanks Yuzhu!)

Remove connection and interface pointer from AppListPresenterMus.

TODO: What's not TODO here? It's a mess!

BUG=670775
TEST=No regressions in chrome --mash app list behavior
R=jamescook@chromium.org,tsepez@chromium.org,xiyuan@chromium.org,rockot@chromium.org

Review-Url: https://codereview.chromium.org/2567523002
Cr-Commit-Position: refs/heads/master@{#438044}