Make gfx::Rect class operations consistently mutate the class they are called on.

ui/gfx/rect_f.h

Index: ui/gfx/rect_f.h
diff --git a/ui/gfx/rect_f.h b/ui/gfx/rect_f.h
index fbdeb4e157a0c6551550fdf4b7af6c6e06fe110c..c6f730d3cc8b05e2cf094a26c47073a65aa3b752 100644
--- a/ui/gfx/rect_f.h
+++ b/ui/gfx/rect_f.h
@@ -27,14 +27,15 @@ class UI_EXPORT RectF : public RectBase<RectF, PointF, SizeF, InsetsF, float> {
   ~RectF();
 
   /// Scales the rectangle by |scale|.
-  RectF Scale(float scale) const WARN_UNUSED_RESULT {
+  void Scale(float scale) {
     return Scale(scale, scale);

[sky, 2012/10/12 16:26:38]

remove 'return' value.

[danakj, 2012/10/19 20:33:53]

Done.

   }
 
-  RectF Scale(float x_scale, float y_scale) const WARN_UNUSED_RESULT {
+  void Scale(float x_scale, float y_scale) {
     SizeF newSize = size().Scale(x_scale, y_scale);
     newSize.ClampToNonNegative();
-    return RectF(origin().Scale(x_scale, y_scale), newSize);
+    set_origin(origin().Scale(x_scale, y_scale));
+    set_size(newSize);
   }
 
   std::string ToString() const;