Replace unique_ptr.reset(other_unique_ptr.release()) with std::move() in cc/trees/

cc/trees/layer_tree_host_common_unittest.cc

Index: cc/trees/layer_tree_host_common_unittest.cc
diff --git a/cc/trees/layer_tree_host_common_unittest.cc b/cc/trees/layer_tree_host_common_unittest.cc
index 4f4511d9efd59b2dd51ce33977b0d5d559cf3a9b..ed9c242b68386d43fd351d9226f4b8c73677186b 100644
--- a/cc/trees/layer_tree_host_common_unittest.cc
+++ b/cc/trees/layer_tree_host_common_unittest.cc
@@ -5728,7 +5728,7 @@ TEST_F(LayerTreeHostCommonTest, TransformedClipParent) {
   clip_child->test_properties()->clip_parent = clip_parent;
   std::unique_ptr<std::set<LayerImpl*>> clip_children(new std::set<LayerImpl*>);
   clip_children->insert(clip_child);
-  clip_parent->test_properties()->clip_children.reset(clip_children.release());
+  clip_parent->test_properties()->clip_children = std::move(clip_children);
 
   intervening->SetMasksToBounds(true);
   clip_parent->SetMasksToBounds(true);