[Clean Skeleton] Migrate code to clean/

ios/chrome/browser/url_opening.h

Index: ios/chrome/browser/url_opening.h
diff --git a/ios/chrome/browser/url_opening.h b/ios/chrome/browser/url_opening.h
deleted file mode 100644
index f6c408b9b58b5e1f4dbe28c8384f82a3c4974efb..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/url_opening.h
+++ /dev/null
@@ -1,21 +0,0 @@
-// 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_BROWSER_URL_OPENING_H_
-#define IOS_CHROME_BROWSER_URL_OPENING_H_
-
-#import <Foundation/Foundation.h>
-
-// Protocol adopted by objects that can "open" (usually this means loading in a
-// web view) URLs.
-@protocol URLOpening
-// Opens |url|. Any kind of failure happens silently.
-- (void)openURL:(NSURL*)URL;
-@end
-
-#endif  // IOS_CHROME_BROWSER_URL_OPENING_H_