It is time.

ui/compositor/compositor_observer.cc

Index: ui/compositor/compositor_observer.cc
diff --git a/ui/compositor/compositor_observer.cc b/ui/compositor/compositor_observer.cc
deleted file mode 100644
index 209cd5220b38b46c6c206447e39c75795379554f..0000000000000000000000000000000000000000
--- a/ui/compositor/compositor_observer.cc
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright 2014 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/compositor_observer.h"
-
-#include "base/logging.h"
-
-namespace ui {
-
-#if defined(OS_MACOSX)
-// Debugging instrumentation for crbug.com/401630.
-// TODO(ccameron): remove this.
-CompositorObserver::CompositorObserver() : observing_count_(0) {}
-#else
-CompositorObserver::CompositorObserver() {}
-#endif
-
-CompositorObserver::~CompositorObserver() {
-#if defined(OS_MACOSX)
-  // Debugging instrumentation for crbug.com/401630.
-  // TODO(ccameron): remove this.
-  CHECK_EQ(observing_count_, 0);
-#endif
-}
-
-}
-