It is time.

ui/compositor/test/test_layers.cc

Index: ui/compositor/test/test_layers.cc
diff --git a/ui/compositor/test/test_layers.cc b/ui/compositor/test/test_layers.cc
deleted file mode 100644
index 2e71eac70b1e903d55684f0607bdc001a2310192..0000000000000000000000000000000000000000
--- a/ui/compositor/test/test_layers.cc
+++ /dev/null
@@ -1,24 +0,0 @@
-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "ui/compositor/test/test_layers.h"
-
-#include "ui/compositor/layer.h"
-
-namespace ui {
-namespace test {
-
-std::string ChildLayerNamesAsString(const ui::Layer& parent) {
-  std::string names;
-  for (std::vector<Layer*>::const_iterator it = parent.children().begin();
-       it != parent.children().end(); ++it) {
-    if (!names.empty())
-      names += " ";
-    names += (*it)->name();
-  }
-  return names;
-}
-
-}  // namespace test
-}  // namespace ui