Update {virtual,override} to follow C++11 style in components.

components/webdata/common/web_data_results.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 COMPONENTS_WEBDATA_COMMON_WEB_DATA_RESULTS_H_
 #define COMPONENTS_WEBDATA_COMMON_WEB_DATA_RESULTS_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "components/webdata/common/webdata_export.h"
@@ skipping 49 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(WDTypedResult);
 };
 
 // A result containing one specific pointer or literal value.
 template <class T> class WDResult : public WDTypedResult {
  public:
   WDResult(WDResultType type, const T& v)
       : WDTypedResult(type), value_(v) {
   }
 
-  virtual ~WDResult() {
+  ~WDResult() override {
   }
 
   // Return a single value result.
   T GetValue() const {
     return value_;
   }
 
  private:
   T value_;
 
   DISALLOW_COPY_AND_ASSIGN(WDResult);
 };
 
 template <class T> class WDDestroyableResult : public WDResult<T> {
  public:
   WDDestroyableResult(
       WDResultType type,
       const T& v,
       const DestroyCallback& callback)
       : WDResult<T>(type, v),
         callback_(callback) {
   }
 
-  virtual ~WDDestroyableResult() {
+  ~WDDestroyableResult() override {
   }
 
-
-  virtual void Destroy()  override {
+  void Destroy() override {
     if (!callback_.is_null()) {
       callback_.Run(this);
     }
   }
 
  private:
   DestroyCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(WDDestroyableResult);
 };
 
 #endif  // COMPONENTS_WEBDATA_COMMON_WEB_DATA_RESULTS_H_