Revert "[ChromeDriver] Making CloseWindow W3C Compliant"

This reverts commit be44dc6b6bc15c5d49f589a0a4d4568e3d9d4030.

Reason for revert: Suspecting that this patch caused major flaky of chromedriver_py_tests on win

Original change's description:
> [ChromeDriver] Making CloseWindow W3C Compliant
> 
> Making CloseWindow W3C compliant by returning the result of
> GetWindowHandles. Modified testCloseWindow in run_py_tests.py
> to test this conformance.
> 
> Bug: chromedriver:1990
> Change-Id: I2e90e9e9ca16559ea3678846a7d605b402b4d431
> Reviewed-on: https://chromium-review.googlesource.com/1115813
> Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
> Reviewed-by: John Chen <johnchen@chromium.org>
> Commit-Queue: Cole Winstanley <cwinstanley@google.com>
> Cr-Commit-Position: refs/heads/master@{#571334}

TBR=crouleau@chromium.org,johnchen@chromium.org,kereliuk@chromium.org,cwinstanley@google.com

Change-Id: Iae1e975140df2381d21a271fcfd9b5651b6ac4ae
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromedriver:1990, 859079
Reviewed-on: https://chromium-review.googlesource.com/1120466
Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571485}
3 files changed