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In content_shell --run-web-tests on linux there is no SelectFileDialog
implementation. Deal with this by aborting the dialog if we failed to
create one.

Bug: 1027908
Change-Id: Ibf4d3f1f91a719945140d88deb89dd3218efda36
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314808
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791115}