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This CL ensures we do not spam the user's Application directory on Mac
when syncing down installed PWAs. This makes Mac behave the same as
Windows and Linux.

Bug: 929559
Change-Id: I31df57e7d8228b2a47cc362f258afeee2dc840ef
Reviewed-on: https://chromium-review.googlesource.com/c/1457698
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Ben Wells <benwells@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629935}