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gpu/vulkan was not compiling on Windows. This fixes the errors.

Bug: 961874
Change-Id: I7c3412819d0d445d48c12f43ce175284317c99d1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610450Reviewed-by: Jonathan Ross <jonross@chromium.org>
Reviewed-by: Jonathan Backer <backer@chromium.org>
Commit-Queue: Jonathan Ross <jonross@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659191}