Fix UB with LayerTreeImpl::PassSwapPromises usage

cc/trees/layer_tree_impl.cc

Index: cc/trees/layer_tree_impl.cc
diff --git a/cc/trees/layer_tree_impl.cc b/cc/trees/layer_tree_impl.cc
index 0f0a4da885297f60b68da03d91be19dcaf6303dd..cff7fbe4744b58755f3dfbd8cf2e13e51398f100 100644
--- a/cc/trees/layer_tree_impl.cc
+++ b/cc/trees/layer_tree_impl.cc
@@ -425,7 +425,11 @@ void LayerTreeImpl::PushPropertiesTo(LayerTreeImpl* target_tree) {
     next_activation_forces_redraw_ = false;
   }
 
-  target_tree->PassSwapPromises(std::move(swap_promise_list_));
+  {
+    std::vector<std::unique_ptr<SwapPromise>> to_pass;
+    swap_promise_list_.swap(to_pass);
+    target_tree->PassSwapPromises(std::move(to_pass));
+  }
 
   target_tree->set_top_controls_shrink_blink_size(
       top_controls_shrink_blink_size_);