Replace GraphicsContext::setupPaintFor* with const getters.

Source/platform/graphics/StrokeData.h

Index: Source/platform/graphics/StrokeData.h
diff --git a/Source/platform/graphics/StrokeData.h b/Source/platform/graphics/StrokeData.h
index 884ad631deacfe253cda93ccdab9b666576f3a92..2a075a995a340eb5b8ae9170d96877af9644a738 100644
--- a/Source/platform/graphics/StrokeData.h
+++ b/Source/platform/graphics/StrokeData.h
@@ -84,9 +84,9 @@ public:
     void setLineDash(const DashArray&, float);
 
     // Sets everything on the paint except the pattern, gradient and color.
-    // GraphicsContext::setupShader does that. If a non-zero length is provided, the
-    // number of dashes/dots on a dashed/dotted line will be adjusted to
-    // start and end that length with a dash/dot.
+    // If a non-zero length is provided, the number of dashes/dots on a
+    // dashed/dotted line will be adjusted to start and end that length with a
+    // dash/dot.
     void setupPaint(SkPaint*, int length = 0) const;
 
     // Setup any DashPathEffect on the paint. If a non-zero length is provided,