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This change adds an InSettings attribute that is used to determine whether
the File Manager should be automatically opened on a successful mount call.
When mounting from the free-form dialog, the File Manager will not be
automatically opened.

Bug: chromium:887135
Test: browser_tests --gtest_filter=CrSettingsSmb*
Change-Id: I4e681c1ffe104f234784c2f958d24b2d257bc33c
Reviewed-on: https://chromium-review.googlesource.com/c/1336911Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613197}