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Since the real dependency is for Download Manager to suggest the
installation of Google Drive if Google Drive is not already installed,
it will make the implementation much simpler to directly query
existence of Google Drive app than to go through Google App Launcher.

Bug: 741948
Change-Id: Id121fed82ccf578c4d1373089df0e3045a7fe2c8
Reviewed-on: https://chromium-review.googlesource.com/568635Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486922}