Fix header guard typos.

This is preventing compilation on Linux with clang.

R=robertphillips@google.com

Review URL: https://codereview.chromium.org/18131007

git-svn-id: http://skia.googlecode.com/svn/trunk/include@9905 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed