cc: Remove unused proto conversion code.

blimp/client/test/compositor/blimp_compositor_with_fake_host.cc

Index: blimp/client/test/compositor/blimp_compositor_with_fake_host.cc
diff --git a/blimp/client/test/compositor/blimp_compositor_with_fake_host.cc b/blimp/client/test/compositor/blimp_compositor_with_fake_host.cc
index af1093f09e21413ff7b18d91d47b7886353cbe54..143f553c23dbbc1016238af3f086e77e126a9d9f 100644
--- a/blimp/client/test/compositor/blimp_compositor_with_fake_host.cc
+++ b/blimp/client/test/compositor/blimp_compositor_with_fake_host.cc
@@ -39,7 +39,7 @@ BlimpCompositorWithFakeHost::CreateFakeUpdate(
   layer_tree->SetRootLayer(root_layer);
   cc::proto::LayerTree* layer_tree_proto =
       message->mutable_layer_tree_host()->mutable_layer_tree();
-  layer_tree->ToProtobuf(layer_tree_proto, true);
+  layer_tree->ToProtobuf(layer_tree_proto);
   return message;
 }