Disable one screen orientation layout tests to enable design changes.

The mock is currently assuming that the screen orientation is handled
by a RendererWebKitPlatformSupportImpl which is no longer the case. It
will move to be part of WebFrameTestProxy but that will require a two
sided patch so we should first disable the false-negative.

BUG=162827

Review URL: https://codereview.chromium.org/339553003

git-svn-id: svn://svn.chromium.org/blink/trunk@176203 bbb929c8-8fbe-4397-9dbb-9b2b20218538