Move undo files into //components/undo

chrome/browser/undo/undo_operation.h

-// 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 CHROME_BROWSER_UNDO_UNDO_OPERATION_H_
-#define CHROME_BROWSER_UNDO_UNDO_OPERATION_H_
-
-// Base class for all undo operations.
-class UndoOperation {
- public:
-  virtual ~UndoOperation() {}
-
-  virtual void Undo() = 0;
-
-  // Returns the resource string id describing the undo/redo of this operation
-  // for use as labels in the UI.
-  // Note: The labels describe the original user action, this may result in
-  // the meaning of the redo label being reversed. For example, an
-  // UndoOperation representing a deletion would have been created in order to
-  // redo an addition by the user. In this case, the redo label string for the
-  // UndoOperation of delete would be "Redo add".
-  virtual int GetUndoLabelId() const = 0;
-  virtual int GetRedoLabelId() const = 0;
-};
-
-#endif  // CHROME_BROWSER_UNDO_UNDO_OPERATION_H_