Disabling EGLSyncControlTest.SyncValuesTest for now until I can get
it stable on Windows 8.

BUG=angleproject:1402

Change-Id: I21a770e0f8516916c6987ba66ec49762cd99b78a
Reviewed-on: https://chromium-review.googlesource.com/395577Reviewed-by: Stanislav Chiknavaryan <stanisc@chromium.org>
Commit-Queue: Stanislav Chiknavaryan <stanisc@chromium.org>