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instead of empty FileChooserResult.

Receivers of the message, Blink and Pepper, still assume the null
FileChooserResult and the empty FileChooserResult have same meaning.
However this CL makes it possible to fix crbug.com/2508.

This CL doesn't have user-visible behavior changes.

Bug: 2508
Change-Id: I14b17e68116d475d6fd49f4a965d8a6c49418b32
Reviewed-on: https://chromium-review.googlesource.com/c/1343815Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609863}