cc: Fix overlay damage tracking bug

cc/output/overlay_strategy_underlay.cc

Index: cc/output/overlay_strategy_underlay.cc
diff --git a/cc/output/overlay_strategy_underlay.cc b/cc/output/overlay_strategy_underlay.cc
index 5f3f907445b530a9859bca8cf42c78e45dca219a..9a8a3628d55bfc8511fc9122ee216e1d754d6898 100644
--- a/cc/output/overlay_strategy_underlay.cc
+++ b/cc/output/overlay_strategy_underlay.cc
@@ -20,8 +20,7 @@ OverlayStrategyUnderlay::~OverlayStrategyUnderlay() {}
 
 bool OverlayStrategyUnderlay::Attempt(ResourceProvider* resource_provider,
                                       RenderPassList* render_passes,
-                                      OverlayCandidateList* candidate_list,
-                                      gfx::Rect* damage_rect) {
+                                      OverlayCandidateList* candidate_list) {
   QuadList& quad_list = render_passes->back()->quad_list;
   for (auto it = quad_list.begin(); it != quad_list.end(); ++it) {
     OverlayCandidate candidate;