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This reverts commit e3121f99.

Reason for revert: Looks like it broke Win10 (Debug|Release) (NVIDIA)
See https://ci.chromium.org/p/chromium/builders/ci/Win10%20Debug%20%28NVIDIA%29/23156 for example failure.

Original change's description:
> Switch Windows 10 GPU testing to 64-bit.
> 
> See
> https://chromium-review.googlesource.com/c/chromium/tools/build/+/1750303
> 
> Bug: 988833
> Change-Id: If6082a035eec474d3299afb89bd78ca225d95ed6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1747005
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
> Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#686321}

TBR=ynovikov@chromium.org,kbr@chromium.org,tikuta@chromium.org

Change-Id: If0922864c7beaa2209933d47c1bf7385c3b39a42
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 988833
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1750470Reviewed-by: Fergus Dall <sidereal@google.com>
Commit-Queue: Fergus Dall <sidereal@google.com>
Cr-Commit-Position: refs/heads/master@{#686333}