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Since AppListClientImpl and AppListControllerImpl depend on each other
tightly, we can merge them. All Chrome components talk to Ash via the
AppListControllerDelegate interface, and AppListClientImpl implements
it. That's similar to the Ash AppListControllerImpl implementing
AppListViewDelegate.

This commit also merges app_list_controller_browsertest.cc with
app_list_browsertest.cc and renames those tests into AppListClient*.

Bug: 733662
Change-Id: I570d46b540d8bf23198f34e8ea8810dc3f026ab1
Reviewed-on: https://chromium-review.googlesource.com/1100554Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Jiaquan He <hejq@google.com>
Cr-Commit-Position: refs/heads/master@{#567834}