[ios] Move WebStateList to ios/chrome/browser/web_state_list.

ios/chrome/browser/web_state_list/web_state_list_observer.h

Index: ios/chrome/browser/web_state_list/web_state_list_observer.h
diff --git a/ios/shared/chrome/browser/tabs/web_state_list_observer.h b/ios/chrome/browser/web_state_list/web_state_list_observer.h
similarity index 93%
rename from ios/shared/chrome/browser/tabs/web_state_list_observer.h
rename to ios/chrome/browser/web_state_list/web_state_list_observer.h
index 4d4134162f0962d7970e212e11c32ba7bf9e4b13..7cc887acccd2e4009b224314898daafe2b148eb0 100644
--- a/ios/shared/chrome/browser/tabs/web_state_list_observer.h
+++ b/ios/chrome/browser/web_state_list/web_state_list_observer.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef IOS_SHARED_CHROME_BROWSER_TABS_WEB_STATE_LIST_OBSERVER_H_
-#define IOS_SHARED_CHROME_BROWSER_TABS_WEB_STATE_LIST_OBSERVER_H_
+#ifndef IOS_CHROME_BROWSER_WEB_STATE_LIST_WEB_STATE_LIST_OBSERVER_H_
+#define IOS_CHROME_BROWSER_WEB_STATE_LIST_WEB_STATE_LIST_OBSERVER_H_
 
 #include "base/macros.h"
 
@@ -71,4 +71,4 @@ class WebStateListObserver {
   DISALLOW_COPY_AND_ASSIGN(WebStateListObserver);
 };
 
-#endif  // IOS_SHARED_CHROME_BROWSER_TABS_WEB_STATE_LIST_OBSERVER_H_
+#endif  // IOS_CHROME_BROWSER_WEB_STATE_LIST_WEB_STATE_LIST_OBSERVER_H_