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We no longer collect Vulkan info for UMA at the browser start. Rename
command line switch to DX12 only. This switch is mainly used for testing.

Change --disable-gpu-process-for-dx12-vulkan-info-collection to
--disable-gpu-process-for-dx12-info-collection
and
Change kDisableGpuProcessForDX12VulkanInfoCollection[] to
kDisableGpuProcessForDX12InfoCollection[]

Bug: 775983
Change-Id: Iddbac1fb81cddce16df8910109fba1b6ddfb8089
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2280587Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Maggie Chen <magchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787850}