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This reverts commit 95ae7232.

Reason for revert: Breaking windows compile, e.g. https://build.chromium.org/p/chromium/builders/Win/builds/59641

Original change's description:
> Make CQ run vr_common_unittests on Windows
> 
> There were a few clang-specific C++ extensions in use, and some warnings that hit only on MSVC.
> gltf tests had to be disabled because url->path parsing is not correct on Windows.
> 
> BUG=744675
> 
> Change-Id: Ica976477da4b5009a68d738e71ee995af871d1f7
> Reviewed-on: https://chromium-review.googlesource.com/695807
> Commit-Queue: Bill Orr <billorr@chromium.org>
> Reviewed-by: Jochen Eisinger <jochen@chromium.org>
> Reviewed-by: Christopher Grant <cjgrant@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#506866}

TBR=cjgrant@chromium.org,bsheedy@chromium.org,billorr@google.com,jochen@chromium.org,billorr@chromium.org

Change-Id: I0047a3d865fc7ee4eadc9bbaf1ff5942366daa53
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 744675
Reviewed-on: https://chromium-review.googlesource.com/704056Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Ken Rockot <rockot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506937}