cc: Don't pass simple well-defined classes by reference.

cc/quads/shared_quad_state.h

Index: cc/quads/shared_quad_state.h
diff --git a/cc/quads/shared_quad_state.h b/cc/quads/shared_quad_state.h
index 384fa81af0cc8c0006a9edde0789b1fb34e76ece..eb3e91eaedb905235e77efd599d7c065791aadea 100644
--- a/cc/quads/shared_quad_state.h
+++ b/cc/quads/shared_quad_state.h
@@ -20,9 +20,9 @@ class CC_EXPORT SharedQuadState {
   scoped_ptr<SharedQuadState> Copy() const;
 
   void SetAll(const gfx::Transform& content_to_target_transform,
-              const gfx::Size content_bounds,
-              const gfx::Rect& visible_content_rect,
-              const gfx::Rect& clip_rect,
+              gfx::Size content_bounds,
+              gfx::Rect visible_content_rect,
+              gfx::Rect clip_rect,
               bool is_clipped,
               float opacity);