ui: Make gfx::Point::Scale() mutate the class, similar to gfx::Rect.

ui/gfx/point.h

Index: ui/gfx/point.h
diff --git a/ui/gfx/point.h b/ui/gfx/point.h
index 2e476d0e061464af2111e431ab551fa9ce21ec2f..133e93602da7e50713a011272078d1fbdcab74fb 100644
--- a/ui/gfx/point.h
+++ b/ui/gfx/point.h
@@ -49,14 +49,6 @@ class UI_EXPORT Point : public PointBase<Point, int, Vector2d> {
     return PointF(x(), y());
   }
 
-  PointF Scale(float scale) const WARN_UNUSED_RESULT {
-    return Scale(scale, scale);
-  }
-
-  PointF Scale(float x_scale, float y_scale) const WARN_UNUSED_RESULT {
-    return PointF(x() * x_scale, y() * y_scale);
-  }
-
   // Returns a string representation of point.
   std::string ToString() const;
 };