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Until PDF is supported, set PNG as the default file type.

Bug: 1059779
Change-Id: I6675e6526de668d8cafb1152baeb94ed37e7f13c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506111
Auto-Submit: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821885}