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The default ctor is used for mojo. These fields are not copied over so
they need to be initialized.

Bug: 824097
Change-Id: I2f37acfbc36790c53064d2c467989878674c6e43
Reviewed-on: https://chromium-review.googlesource.com/973541Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544799}