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This change makes the D-Bus timeout for the CopyEntry method
infinite since currently each CopyEntry call can take an
undefined amount of time on the SmbProvider daemon side.

BUG=chromium:757625
TEST=none

Change-Id: I6da15c49a80062fa05f8c622e3ea3c402f69d8f2
Reviewed-on: https://chromium-review.googlesource.com/1054200Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Zentaro Kavanagh <zentaro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557612}