Standardize usage of virtual/override/final in components/

components/policy/core/common/preferences_mock_mac.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 COMPONENTS_POLICY_CORE_COMMON_PREFERENCES_MOCK_MAC_H_
 #define COMPONENTS_POLICY_CORE_COMMON_PREFERENCES_MOCK_MAC_H_
 
 #include "base/mac/scoped_cftyperef.h"
 #include "components/policy/core/common/preferences_mac.h"
 #include "components/policy/policy_export.h"
 
 // Mock preferences wrapper for testing code that interacts with CFPreferences.
 class POLICY_EXPORT MockPreferences : public MacPreferences {
  public:
   MockPreferences();
-  virtual ~MockPreferences();
+  ~MockPreferences() override;
 
-  virtual Boolean AppSynchronize(CFStringRef applicationID) override;
+  Boolean AppSynchronize(CFStringRef applicationID) override;
 
-  virtual CFPropertyListRef CopyAppValue(CFStringRef key,
-                                         CFStringRef applicationID) override;
+  CFPropertyListRef CopyAppValue(CFStringRef key,
+                                 CFStringRef applicationID) override;
 
-  virtual Boolean AppValueIsForced(CFStringRef key,
-                                   CFStringRef applicationID) override;
+  Boolean AppValueIsForced(CFStringRef key, CFStringRef applicationID) override;
 
   // Adds a preference item with the given info to the test set.
   void AddTestItem(CFStringRef key, CFPropertyListRef value, bool is_forced);
 
  private:
   base::ScopedCFTypeRef<CFMutableDictionaryRef> values_;
   base::ScopedCFTypeRef<CFMutableSetRef> forced_;
 };
 
 #endif  // COMPONENTS_POLICY_CORE_COMMON_PREFERENCES_MOCK_MAC_H_