[Clean Skeleton] Migrate code to clean/

ios/clean/chrome/app/application_step.h

 // Copyright 2016 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.
 
 // ======                        New Architecture                         =====
 // =         This code is only used in the new iOS Chrome architecture.       =
 // ============================================================================
 
-#ifndef IOS_CHROME_APP_APPLICATION_STEP_H_
-#define IOS_CHROME_APP_APPLICATION_STEP_H_
+#ifndef IOS_CLEAN_CHROME_APP_APPLICATION_STEP_H_
+#define IOS_CLEAN_CHROME_APP_APPLICATION_STEP_H_
 
 #import <Foundation/Foundation.h>
 
 @class ApplicationState;
 
 // Objects that perform application state change steps must conform to this
 // protocol.
 @protocol ApplicationStep<NSObject>
 // Implementors should not modify |state| in -canRunInState.
 - (BOOL)canRunInState:(ApplicationState*)state;
 
 // Implementors should expect to be deallocated after -runInState is called.
 // If an implementor creates objects that need to persist longer than that, they
 // should be stored in |state.state|.
 // Implementors can assume that they are not in any of |state|'s step arrays
 // when this method is called.
 - (void)runInState:(ApplicationState*)state;
 @end
 
-#endif  // IOS_CHROME_APP_APPLICATION_STEP_H_
+#endif  // IOS_CLEAN_CHROME_APP_APPLICATION_STEP_H_