Replace GraphicsContext::setupPaintFor* with const getters.

Source/platform/fonts/harfbuzz/FontHarfBuzz.cpp

Index: Source/platform/fonts/harfbuzz/FontHarfBuzz.cpp
diff --git a/Source/platform/fonts/harfbuzz/FontHarfBuzz.cpp b/Source/platform/fonts/harfbuzz/FontHarfBuzz.cpp
index e35b8c5924f950530553310c430452d61528dae7..2af3aba2ec31e3eb2dd68cda77a4d08ebc791535 100644
--- a/Source/platform/fonts/harfbuzz/FontHarfBuzz.cpp
+++ b/Source/platform/fonts/harfbuzz/FontHarfBuzz.cpp
@@ -64,8 +64,7 @@ static void paintGlyphs(GraphicsContext* gc, const SimpleFontData* font,
 
     // We draw text up to two times (once for fill, once for stroke).
     if (textMode & TextModeFill) {
-        SkPaint paint;
-        gc->setupPaintForFilling(&paint);
+        SkPaint paint = gc->fillPaint();
         font->platformData().setupPaint(&paint, gc);
         gc->adjustTextRenderMode(&paint);
         paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
@@ -77,8 +76,7 @@ static void paintGlyphs(GraphicsContext* gc, const SimpleFontData* font,
         && gc->strokeStyle() != NoStroke
         && gc->strokeThickness() > 0) {
 
-        SkPaint paint;
-        gc->setupPaintForStroking(&paint);
+        SkPaint paint = gc->strokePaint();
         font->platformData().setupPaint(&paint, gc);
         gc->adjustTextRenderMode(&paint);
         paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);