Revert "media: Reenable TestPolicyCheck() on Windows for Widevine"

This reverts commit 3a127077.

Reason for revert: The test is still failing on Win64 trunk and Win trunk on official continuous desktop builder.

Original change's description:
> media: Reenable TestPolicyCheck() on Windows for Widevine
> 
> The original problem has been fixed in the latest Widevine CDM.
> 
> Bug: 851027
> Change-Id: I9aced3ea2152e33fcc8a5bcddc8a587c45dee6cc
> Reviewed-on: https://chromium-review.googlesource.com/1154087
> Reviewed-by: Frank Liberato <liberato@chromium.org>
> Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#579615}

TBR=xhwang@chromium.org,liberato@chromium.org

Change-Id: I1446eb5919ac014420fe7095d7916ee92cbb3d57
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 851027
Reviewed-on: https://chromium-review.googlesource.com/1158767Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579823}

chrome/browser/media/encrypted_media_browsertest.cc

@@ -453,7 +453,8 @@ class EncryptedMediaTest
   void TestPolicyCheck() {
 // TODO(crbug.com/847591): ChromeOS Widevine CDM does not support policy check
 // API yet. Remove this condition when the CDM is updated.
-#if defined(WIDEVINE_CDM_AVAILABLE) && defined(OS_CHROMEOS)
+// TODO(crbug.com/851027): Reenable this test on Windows after bug is fixed.
+#if defined(WIDEVINE_CDM_AVAILABLE) && (defined(OS_CHROMEOS) || defined(OS_WIN))
     if (IsWidevine(CurrentKeySystem())) {
       DVLOG(0) << "Skipping test due to HDCP policy check related bugs.";
       return;