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On Mac, the --show-app-list flag causes the AppLauncher to start loading before the Profile is loaded. For this, the profile_path is sent to AppListService::InitAll(), so that this load can be aborted if it would point to a Locked Profile.

The AppListService will no longer permit loading a locked profile, and will direct to the UserManager instead. StartupBrowserCreator has a similar flow.

BUG=421308
TEST=Try to load the App Launcher for a locked profile in any possible way the Launcher can be launched ;) It should always direct to the UserManager, upon Profile Selection which then directs to the AppLauncher. Opening the AppLauncher for a non-locked profile should always work smoothly.

Review URL: https://codereview.chromium.org/856733004

Cr-Commit-Position: refs/heads/master@{#313583}