Split GrSWMaskHelper into its own files

http://codereview.appspot.com/6350046/



git-svn-id: http://skia.googlecode.com/svn/trunk@4380 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrClipMaskManager.cpp b/src/gpu/GrClipMaskManager.cpp
index 0c4353a..cb543e1 100644
--- a/src/gpu/GrClipMaskManager.cpp
+++ b/src/gpu/GrClipMaskManager.cpp
@@ -15,9 +15,7 @@
 #include "SkRasterClip.h"
 #include "GrAAConvexPathRenderer.h"
 #include "GrAAHairLinePathRenderer.h"
-
-// TODO: move GrSWMaskHelper out of GrSoftwarePathRender.h & remove this include
-#include "GrSoftwarePathRenderer.h"
+#include "GrSWMaskHelper.h"
 
 //#define GR_AA_CLIP 1
 //#define GR_SW_CLIP 1