Handle an unknown error when exiting fullscreen on Windows 8.

BUG=361553

Change-Id: I6d3e843a8ae06f1bbd5313ed95e338cb0b74fef3
Reviewed-on: https://chromium-review.googlesource.com/194128
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Reviewed-by: John Bauman <jbauman@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>
(cherry picked from commit 74697cf2064c0a2c0d7e1b1b28db439286766a05)
Reviewed-on: https://chromium-review.googlesource.com/195180
Tested-by: Nicolas Capens <nicolascapens@chromium.org>

• src/libGLESv2/renderer/d3d9/SwapChain9.cpp[diff]