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Previously ui::SelectedFileInfo's constructor has a fallback to use the file
path instead of an emtpy local path. But this fallback can assign non-native
paths like '/special/drive/xxx' to local_path variable when the file does not
have a snapshot.

The CL removes the fallback, and modify the default behavior of
FileSelectDialog::Lister so that it routes an empty local_path to file_path.

BUG=126902
TEST=manually

Review URL: https://codereview.chromium.org/666693004

Cr-Commit-Position: refs/heads/master@{#300628}