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

webkit/plugins/ppapi/ppb_graphics_2d_impl.cc

Index: webkit/plugins/ppapi/ppb_graphics_2d_impl.cc
diff --git a/webkit/plugins/ppapi/ppb_graphics_2d_impl.cc b/webkit/plugins/ppapi/ppb_graphics_2d_impl.cc
index e6831a7f8881b30c100a2e37e63095bc27c32a93..0c0e30bad48bb973e6b4ab143fdad939cf07954b 100644
--- a/webkit/plugins/ppapi/ppb_graphics_2d_impl.cc
+++ b/webkit/plugins/ppapi/ppb_graphics_2d_impl.cc
@@ -649,14 +649,14 @@ bool PPB_Graphics2D_Impl::ConvertToLogicalPixels(float scale,
   if (delta) {
     gfx::Point original_delta = *delta;
     float inverse_scale = 1.0f / scale;
-    *delta = gfx::ToFlooredPoint(delta->Scale(scale));
+    *delta = gfx::ToFlooredPoint(gfx::ScalePoint(*delta, scale));
 
     gfx::Rect inverse_scaled_rect =
         gfx::ToEnclosingRect(gfx::ScaleRect(*op_rect, inverse_scale));
     if (original_rect != inverse_scaled_rect)
       return false;
     gfx::Point inverse_scaled_point =
-        gfx::ToFlooredPoint(delta->Scale(inverse_scale));
+        gfx::ToFlooredPoint(gfx::ScalePoint(*delta, inverse_scale));
     if (original_delta != inverse_scaled_point)
       return false;
   }