Revert "Delete the ViewManager and WindowManager services."

mojo/services/view_manager/cpp/keys.h

 // 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.
 
-#ifndef MOJO_ICU_ICU_H_
-#define MOJO_ICU_ICU_H_
+#ifndef MOJO_SERVICES_VIEW_MANAGER_CPP_KEYS_H_
+#define MOJO_SERVICES_VIEW_MANAGER_CPP_KEYS_H_
 
 namespace mojo {
-class ApplicationImpl;
 
-namespace icu {
+extern const char kViewManagerKeyWantsTouchEvents[];
 
-void Initialize(ApplicationImpl* app);
-
-}  // namespace icu
 }  // namespace mojo
 
-#endif  // MOJO_ICU_ICU_H_
+#endif  // MOJO_SERVICES_VIEW_MANAGER_CPP_KEYS_H_