Extract content dependency from keyboard code

ui/keyboard/content/keyboard_constants.cc

Index: ui/keyboard/content/keyboard_constants.cc
diff --git a/ui/keyboard/keyboard_constants.cc b/ui/keyboard/content/keyboard_constants.cc
similarity index 68%
rename from ui/keyboard/keyboard_constants.cc
rename to ui/keyboard/content/keyboard_constants.cc
index b13a604f3d14f7f7d66869a33b8df633c70d28f2..449f96f4127ad224a4ebc037f0598b2dd85c13d3 100644
--- a/ui/keyboard/keyboard_constants.cc
+++ b/ui/keyboard/content/keyboard_constants.cc
@@ -1,8 +1,8 @@
-// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Copyright 2015 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/keyboard/keyboard_constants.h"
+#include "ui/keyboard/content/keyboard_constants.h"
 
 namespace keyboard {