[Clean Skeleton] Migrate code to clean/

ios/chrome/app/application_phase.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_PHASE_H_
-#define IOS_CHROME_APP_APPLICATION_PHASE_H_
-
-// The phases that the application moves through as it transitions between
-// states.
-typedef NS_ENUM(NSUInteger, ApplicationPhase) {
-  // The initial state of the application performing a cold launch.
-  APPLICATION_COLD,
-  // The minimal initialization that must be completed before any further
-  // startup can happen. |applicationDidFinishLaunching:withOptions:| must
-  // bring the appication to at least this phase before returning.
-  APPLICATION_BASIC,
-  // The phase required for any background handling.
-  APPLICATION_BACKGROUNDED,
-  // The phase where the app is foregrounded but Safe Mode has been started.
-  APPLICATION_SAFE_MODE,
-  // The phase where the app is fully foregrounded and the regular UI has
-  // started.
-  APPLICATION_FOREGROUNDED,
-  // The phase where the application has started to terminate.
-  APPLICATION_TERMINATING
-};
-
-#endif  // IOS_CHROME_APP_APPLICATION_PHASE_H_