Standardize usage of virtual/override/final in chrome/browser/

chrome/browser/autocomplete/history_quick_provider.h

Index: chrome/browser/autocomplete/history_quick_provider.h
diff --git a/chrome/browser/autocomplete/history_quick_provider.h b/chrome/browser/autocomplete/history_quick_provider.h
index 6206ee3551a9426fe89f21e07ad764dc2580a54c..fbd93f4e4e9aba5a17ba83f2ff8ddb4d9f2e952e 100644
--- a/chrome/browser/autocomplete/history_quick_provider.h
+++ b/chrome/browser/autocomplete/history_quick_provider.h
@@ -31,8 +31,7 @@ class HistoryQuickProvider : public HistoryProvider {
 
   // AutocompleteProvider. |minimal_changes| is ignored since there is no asynch
   // completion performed.
-  virtual void Start(const AutocompleteInput& input,
-                     bool minimal_changes) override;
+  void Start(const AutocompleteInput& input, bool minimal_changes) override;
 
   // Disable this provider. For unit testing purposes only. This is required
   // because this provider is closely associated with the HistoryURLProvider
@@ -46,7 +45,7 @@ class HistoryQuickProvider : public HistoryProvider {
   FRIEND_TEST_ALL_PREFIXES(HistoryQuickProviderTest, Spans);
   FRIEND_TEST_ALL_PREFIXES(HistoryQuickProviderTest, Relevance);
 
-  virtual ~HistoryQuickProvider();
+  ~HistoryQuickProvider() override;
 
   // Performs the autocomplete matching and scoring.
   void DoAutocomplete();