cc : Make CallFunctionForSubtree on impl use layer iterator

cc/trees/layer_tree_host_unittest_serialization.cc

Index: cc/trees/layer_tree_host_unittest_serialization.cc
diff --git a/cc/trees/layer_tree_host_unittest_serialization.cc b/cc/trees/layer_tree_host_unittest_serialization.cc
index cae21caa5f05fa99ec1cd62e9b643355b740782c..5acc194a63cd4904a7d48507e9a6079f17e68894 100644
--- a/cc/trees/layer_tree_host_unittest_serialization.cc
+++ b/cc/trees/layer_tree_host_unittest_serialization.cc
@@ -46,7 +46,7 @@ class LayerTreeHostSerializationTest : public testing::Test {
   }
 
   void VerifyHostHasAllExpectedLayersInTree(Layer* root_layer) {
-    LayerTreeHostCommon::CallFunctionForSubtree(
+    LayerTreeHostCommon::CallFunctionForEveryLayer(
         root_layer, [root_layer](Layer* layer) {
           DCHECK(layer->layer_tree_host());
           EXPECT_EQ(layer, layer->layer_tree_host()->LayerById(layer->id()));
@@ -171,7 +171,7 @@ class LayerTreeHostSerializationTest : public testing::Test {
     // All layers must have a property tree index that matches PropertyTrees.
     if (layer_tree_host_dst_->property_trees_.sequence_number) {
       int seq_num = layer_tree_host_dst_->property_trees_.sequence_number;
-      LayerTreeHostCommon::CallFunctionForSubtree(
+      LayerTreeHostCommon::CallFunctionForEveryLayer(
           layer_tree_host_dst_->root_layer_.get(), [seq_num](Layer* layer) {
             EXPECT_EQ(seq_num, layer->property_tree_sequence_number());
           });