This reverts commit fc83d355.

Reason for revert: Seems to have broken various tests on

content_browsertests failing on chromium.win/Win7 Tests (dbg)(1)
webkit_tests failing on chromium.webkit/WebKit Win10
webkit_tests failing on chromium.webkit/WebKit Win7 (dbg)

See http://crbug.com/750540 for more details


Original change's description:
> Using SwiftShader for Layout Tests on Windows
> 
> Turing on SwiftShader for Layout Tests on Windows.
> Added expectations for tests which will require rebaselining.
> 
> Bug: 726075
> Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> Change-Id: Ida42b4f47061436d512230059f0ffd9240658b80
> Reviewed-on: https://chromium-review.googlesource.com/514443


> Commit-Queue: Alexis Hétu <sugoi@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#490686}

TBR=sugoi@chromium.org,kbr@chromium.org,capn@chromium.org

Change-Id: Ie1c01eabb2b92cbe5cf988a7b67f0b3a76afcdf4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 726075, 750540
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/593068


Reviewed-by: meade_UTC10 <meade@chromium.org>
Commit-Queue: meade_UTC10 <meade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490699}