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Currently change_list_loader and directory_loader only work for the users
default corpus. We can fix this by passing the team_drive_id and the
root_entry_path as parameters during construction rather then just assuming
the users default corpus root.

With this change we can not use directory_loader and change_list_loader to also
processes changes from team drives by passing the appropriate team_drive_id and
root_entry_path.

Bug: 835703, 833690

Change-Id: I5ba3ed8fa3323dfd520c9e1837934eeef79a30a7
Reviewed-on: https://chromium-review.googlesource.com/1068642
Commit-Queue: Stuart Langley <slangley@chromium.org>
Reviewed-by: Sasha Morrissey <sashab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561767}