It is time.

ui/compositor/compositor_constants.h

Index: ui/compositor/compositor_constants.h
diff --git a/ui/compositor/compositor_constants.h b/ui/compositor/compositor_constants.h
deleted file mode 100644
index ef007b0ff7f3cec38639f798304c7b94435e18ec..0000000000000000000000000000000000000000
--- a/ui/compositor/compositor_constants.h
+++ /dev/null
@@ -1,18 +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.
-
-#ifndef UI_COMPOSITOR_COMPOSITOR_CONSTANTS_H_
-#define UI_COMPOSITOR_COMPOSITOR_CONSTANTS_H_
-
-// This flag is used to work around a rendering bug in Windows where the
-// software surface becomes inconsistent with the hardware surface. This
-// happens in particular circumstances (Classic mode, Chrome using hardware
-// rendering, and the window on a secondary monitor) and when moving the mouse
-// over the window, Windows restores the GDI software surface underneath the
-// mouse, rather than the hardware surface we've painted. As a result, for
-// small or infrequently painting windows, we force back to the software
-// compositor to avoid this bug. See http://crbug.com/333380.
-const wchar_t kForceSoftwareCompositor[] = L"Chrome.ForceSoftwareCompositor";
-
-#endif  // UI_COMPOSITOR_COMPOSITOR_CONSTANTS_H_