Make GrGLDefines.h be a private header

Review URL: http://codereview.appspot.com/6198048/



git-svn-id: http://skia.googlecode.com/svn/trunk@3851 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGLUtil.h b/src/gpu/gl/GrGLUtil.h
index 47e87ad..4b89301 100644
--- a/src/gpu/gl/GrGLUtil.h
+++ b/src/gpu/gl/GrGLUtil.h
@@ -9,6 +9,7 @@
 #define GrGLUtil_DEFINED
 
 #include "gl/GrGLInterface.h"
+#include "GrGLDefines.h"
 
 ////////////////////////////////////////////////////////////////////////////////