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AppServiceDataSource is used for the Apps searching on Chrome OS, so
the Extenions, ARC and Crostini's DataSource can be removed. Related
AppResult is removed too.

ExtensionAppResult is removed as well. So the unit test for
ExtensionAppResult is removed.

BUG=1016159

Change-Id: Ibf3c67b10178419772e2aabb2466721799658336
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1858538Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Commit-Queue: Nancy Wang <nancylingwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708051}