Cleanup: Remove unused includes from skia_unix.cpp

This also move gWindow into the main function.

BUG=None
TEST=SampleApp
R=mtklein@google.com

Review URL: https://codereview.chromium.org/133113002

git-svn-id: http://skia.googlecode.com/svn/trunk@13035 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed