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gfx::GpuFenceHandle already has a notion of a null handle on all
supported platforms. Hence, we don't need to have the corresponding mojo
fields also be nullable.

Bug: 1131616
Change-Id: Ie31775da704aefd26da41516455d397b67c67a27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2485629Reviewed-by: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#819121}