It is time.

ui/views/controls/prefix_delegate.h

Index: ui/views/controls/prefix_delegate.h
diff --git a/ui/views/controls/prefix_delegate.h b/ui/views/controls/prefix_delegate.h
deleted file mode 100644
index 07d85989f0e83cb73cba8537529d08645d1cb557..0000000000000000000000000000000000000000
--- a/ui/views/controls/prefix_delegate.h
+++ /dev/null
@@ -1,34 +0,0 @@
-// Copyright 2013 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_VIEWS_CONTROLS_PREFIX_DELEGATE_H_
-#define UI_VIEWS_CONTROLS_PREFIX_DELEGATE_H_
-
-#include "ui/views/view.h"
-
-namespace views {
-
-// An interface used to expose lists of items for selection by text input.
-class VIEWS_EXPORT PrefixDelegate : public View {
- public:
-  // Returns the total number of selectable items.
-  virtual int GetRowCount() = 0;
-
-  // Returns the row of the currently selected item, or -1 if no item is
-  // selected.
-  virtual int GetSelectedRow() = 0;
-
-  // Sets the selection to the specified row.
-  virtual void SetSelectedRow(int row) = 0;
-
-  // Returns the item at the specified row.
-  virtual base::string16 GetTextForRow(int row) = 0;
-
- protected:
-  virtual ~PrefixDelegate() {}
-};
-
-} // namespace views
-
-#endif // UI_VIEWS_CONTROLS_PREFIX_DELEGATE_H_