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

ios/clean/chrome/browser/ui/tab_collection/tab_collection_mediator.mm

 // Copyright 2017 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.
 
 #import "ios/clean/chrome/browser/ui/tab_collection/tab_collection_mediator.h"
 
 #include "base/memory/ptr_util.h"
 #include "base/strings/sys_string_conversions.h"
-#import "ios/chrome/browser/web_state_list/web_state_list.h"
 #import "ios/clean/chrome/browser/ui/tab_collection/tab_collection_consumer.h"
+#import "ios/shared/chrome/browser/tabs/web_state_list.h"
 #include "ios/web/public/web_state/web_state.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @implementation TabCollectionMediator {
   std::unique_ptr<WebStateListObserverBridge> _webStateListObserver;
 }
 
@@ skipping 93 matching lines @@
   // PLACEHOLDER: Use real webstate title in the future.
   GURL url = webState->GetVisibleURL();
   NSString* urlText = @"<New Tab>";
   if (url.is_valid()) {
     urlText = base::SysUTF8ToNSString(url.spec());
   }
   return urlText;
 }
 
 @end