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This CL git rid of Posix suffix from ImportVkSemaphoreHandlePosix and
GetVkSemaphoreHandlePosix, and rename gpu/vulkan/vulkan_posix_util.cc
to gpu/vulkan/vulkan_util_posix.cc. gpu/vulkan/vulkan_util_posix.h is
removed.

Bug: 1067709
Change-Id: I49551052e2c20b4a7435f020c3f9ae0ec99e7821
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135815
Commit-Queue: Peng Huang <penghuang@chromium.org>
Commit-Queue: Daniele Castagna <dcastagna@chromium.org>
Auto-Submit: Peng Huang <penghuang@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756386}