Remove deprecated SkOSWindow_wxwidgets.h

It seems we never really supported WxWidgets.

R=bsalomon@google.com

Review URL: https://codereview.appspot.com/6569062

git-svn-id: http://skia.googlecode.com/svn/trunk@5708 2bbb7eff-a529-9590-31e7-b0007b416f81
7 files changed