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This is meant to make the code easier to read by making ownership more
obvious and standardize a little bit the different functions that
implement the various dialog types.

Also will facilitate a possible transition to the IFileDialog interface

This CL should not change the behavior of the dialogs.

Bug: 73098,884075
Change-Id: I0d2f5cc02e1d08ab3f54385fb166bc34ae1f5b53
Reviewed-on: https://chromium-review.googlesource.com/c/1249911Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#599827}