Standardize usage of virtual/override/final in components/

components/variations/caching_permuted_entropy_provider.h

 // Copyright 2014 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_VARIATIONS_CACHING_PERMUTED_ENTROPY_PROVIDER_H_
 #define COMPONENTS_VARIATIONS_CACHING_PERMUTED_ENTROPY_PROVIDER_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/threading/thread_checker.h"
 #include "components/variations/entropy_provider.h"
 #include "components/variations/proto/permuted_entropy_cache.pb.h"
 
 class PrefService;
 class PrefRegistrySimple;
 
 namespace metrics {
 
 // CachingPermutedEntropyProvider is an entropy provider that uses the same
 // algorithm as the PermutedEntropyProvider, but caches the results in Local
 // State between runs.
 class CachingPermutedEntropyProvider : public PermutedEntropyProvider {
  public:
   // Creates a CachingPermutedEntropyProvider using the given |local_state|
   // prefs service with the specified |low_entropy_source|, which should have a
   // value in the range of [0, low_entropy_source_max).
   CachingPermutedEntropyProvider(PrefService* local_state,
                                  uint16 low_entropy_source,
                                  size_t low_entropy_source_max);
-  virtual ~CachingPermutedEntropyProvider();
+  ~CachingPermutedEntropyProvider() override;
 
   // Registers pref keys used by this class in the Local State pref registry.
   static void RegisterPrefs(PrefRegistrySimple* registry);
 
   // Clears the cache in local state. Should be called when the low entropy
   // source value gets reset.
   static void ClearCache(PrefService* local_state);
 
  private:
   // PermutedEntropyProvider overrides:
-  virtual uint16 GetPermutedValue(uint32 randomization_seed) const override;
+  uint16 GetPermutedValue(uint32 randomization_seed) const override;
 
   // Reads the cache from local state.
   void ReadFromLocalState() const;
 
   // Updates local state with the state of the cache.
   void UpdateLocalState() const;
 
   // Adds |randomization_seed| -> |value| to the cache.
   void AddToCache(uint32 randomization_seed, uint16 value) const;
 
   // Finds the value corresponding to |randomization_seed|, setting |value| and
   // returning true if found.
   bool FindValue(uint32 randomization_seed, uint16* value) const;
 
   base::ThreadChecker thread_checker_;
   PrefService* local_state_;
   mutable PermutedEntropyCache cache_;
 
   DISALLOW_COPY_AND_ASSIGN(CachingPermutedEntropyProvider);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_VARIATIONS_CACHING_PERMUTED_ENTROPY_PROVIDER_H_