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This CL updates AppLauncherCoordinator to use the browser-based
initializers, and updates unit tests.

Also this CL converts AppLauncherCoordinator to ChromeCoordinator
subclass.

Bug: 906541, 1029346
Change-Id: I327200dd6d7dfbfb9fa032e719996aa319233723
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2010863Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: Nazerke Kalidolda <nazerke@google.com>
Cr-Commit-Position: refs/heads/master@{#733438}