ui: Clean up naming of paint-related identifiers

ui/native_theme/native_theme_base.h

Index: ui/native_theme/native_theme_base.h
diff --git a/ui/native_theme/native_theme_base.h b/ui/native_theme/native_theme_base.h
index 0e4f233e2a02c6b0e5cc69b5dc14d283bdeb648d..f25900235fc4ed808da8dab95b8a8c4130567ca8 100644
--- a/ui/native_theme/native_theme_base.h
+++ b/ui/native_theme/native_theme_base.h
@@ -169,15 +169,15 @@ class NATIVE_THEME_EXPORT NativeThemeBase : public NativeTheme {
                     int x,
                     int y1,
                     int y2,
-                    const cc::PaintFlags& paint) const;
+                    const cc::PaintFlags& flags) const;
   void DrawHorizLine(cc::PaintCanvas* canvas,
                      int x1,
                      int x2,
                      int y,
-                     const cc::PaintFlags& paint) const;
+                     const cc::PaintFlags& flags) const;
   void DrawBox(cc::PaintCanvas* canvas,
                const gfx::Rect& rect,
-               const cc::PaintFlags& paint) const;
+               const cc::PaintFlags& flags) const;
   SkScalar Clamp(SkScalar value,
                  SkScalar min,
                  SkScalar max) const;