Update {virtual,override,final} to follow C++11 style in chrome/browser/chromeos/input_method.

chrome/browser/chromeos/input_method/input_method_engine_interface.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_CHROMEOS_INPUT_METHOD_INPUT_METHOD_ENGINE_INTERFACE_H_
 #define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_ENGINE_INTERFACE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 159 matching lines @@
                                           int cursor_pos,
                                           int anchor_pos) = 0;
 
     // Called when composition bounds are changed.
     virtual void OnCompositionBoundsChanged(const gfx::Rect& bounds) = 0;
 
     // Called when Chrome terminates on-going text input session.
     virtual void OnReset(const std::string& engine_id) = 0;
   };
 
-  virtual ~InputMethodEngineInterface() {}
+  ~InputMethodEngineInterface() override {}
 
   // Set the current composition and associated properties.
   virtual bool SetComposition(int context_id,
                               const char* text,
                               int selection_start,
                               int selection_end,
                               int cursor,
                               const std::vector<SegmentInfo>& segments,
                               std::string* error) = 0;
 
@@ skipping 57 matching lines @@
                                      size_t number_of_chars,
                                      std::string* error) = 0;
 
   // Hides the input view window (from API call).
   virtual void HideInputView() = 0;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_INPUT_METHOD_ENGINE_INTERFACE_H_