chromeos: Fix a clang build error in CandidateWindowView.

chrome/browser/chromeos/input_method/candidate_window_view.h

 // Copyright (c) 2011 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_CHROMEOS_INPUT_METHOD_CANDIDATE_WINDOW_VIEW_H_
 #define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_CANDIDATE_WINDOW_VIEW_H_
 
 #include "chrome/browser/chromeos/input_method/ibus_ui_controller.h"
 #include "views/view.h"
 
@@ skipping 11 matching lines @@
   class Observer {
    public:
     virtual ~Observer() {}
     // The function is called when a candidate is committed.
     // See comments at NotifyCandidateClicked() in chromeos_input_method_ui.h
     // for details about the parameters.
     virtual void OnCandidateCommitted(int index, int button, int flag) = 0;
   };
 
   explicit CandidateWindowView(views::Widget* parent_frame);
-  virtual ~CandidateWindowView() {}
+  virtual ~CandidateWindowView();
   void Init();
 
   // Adds the given observer. The ownership is not transferred.
   void AddObserver(Observer* observer) {
     observers_.AddObserver(observer);
   }
 
   // Removes the given observer.
   void RemoveObserver(Observer* observer) {
     observers_.RemoveObserver(observer);
@@ skipping 134 matching lines @@
   // The last cursor location.
   gfx::Rect cursor_location_;
 
   DISALLOW_COPY_AND_ASSIGN(CandidateWindowView);
 };
 
 }  // namespace input_method
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_CANDIDATE_WINDOW_VIEW_H_