Remove old (dead) app list code.

ui/app_list/app_list_view_delegate.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_
 #define UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 129 matching lines @@
   // Invoked when the custom launcher page's subpage should be popped.
   virtual void CustomLauncherPagePopSubpage() = 0;
 #endif
 
   // Returns true if the delegate supports speech recognition.
   virtual bool IsSpeechRecognitionEnabled() = 0;
 
   // Returns the list of users (for AppListMenu).
   virtual const Users& GetUsers() const = 0;
 
-  // Returns true if the app list should be centered and in landscape mode.
-  virtual bool ShouldCenterWindow() const = 0;
-
   // Adds/removes an observer for profile changes.
   virtual void AddObserver(AppListViewDelegateObserver* observer) {}
   virtual void RemoveObserver(AppListViewDelegateObserver* observer) {}
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_APP_LIST_VIEW_DELEGATE_H_