Disable FL9_3 tests because of Windows 7 failures.

These tests were failing on SwapChain11 with errors relating to
the Depth Stencil backbuffer.

BUG=angle:856
BUG=435726

Change-Id: Idd371a380e9b302d7d5e40437e9d76589872b750
Reviewed-on: https://chromium-review.googlesource.com/237450
Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Update WebGL expectations.

Change-Id: I69795b97ef032838cd43e889119405aaee66fa4f
Reviewed-on: https://chromium-review.googlesource.com/237329
Tested-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>