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

ui/gfx/quad_unittest.cc

Index: ui/gfx/quad_unittest.cc
diff --git a/ui/gfx/quad_unittest.cc b/ui/gfx/quad_unittest.cc
index cb9cef35905994e85cc0838f30fbd17fbaed38ac..8859a0e6972d7f75be0aaf1af99e2a85269857d9 100644
--- a/ui/gfx/quad_unittest.cc
+++ b/ui/gfx/quad_unittest.cc
@@ -345,10 +345,10 @@ TEST(QuadTest, Scale) {
   QuadF q1(a, b, c, d);
   q1.Scale(1.5f);
 
-  PointF a_scaled = a.Scale(1.5f);
-  PointF b_scaled = b.Scale(1.5f);
-  PointF c_scaled = c.Scale(1.5f);
-  PointF d_scaled = d.Scale(1.5f);
+  PointF a_scaled = ScalePoint(a, 1.5f);
+  PointF b_scaled = ScalePoint(b, 1.5f);
+  PointF c_scaled = ScalePoint(c, 1.5f);
+  PointF d_scaled = ScalePoint(d, 1.5f);
   EXPECT_EQ(q1.ToString(),
             QuadF(a_scaled, b_scaled, c_scaled, d_scaled).ToString());