Standardize usage of virtual/override/final specifiers.

chrome/browser/prefs/tracked/pref_hash_filter_unittest.cc

Index: chrome/browser/prefs/tracked/pref_hash_filter_unittest.cc
diff --git a/chrome/browser/prefs/tracked/pref_hash_filter_unittest.cc b/chrome/browser/prefs/tracked/pref_hash_filter_unittest.cc
index 3c3e58ea4c951987e1f5065a16b8727c3a985f00..5440da0e5bcca27e5b1954396a5c3ef251a85d03 100644
--- a/chrome/browser/prefs/tracked/pref_hash_filter_unittest.cc
+++ b/chrome/browser/prefs/tracked/pref_hash_filter_unittest.cc
@@ -366,7 +366,7 @@ class PrefHashFilterTest
                          last_filter_on_load_modified_prefs_(false),
                          reset_recorded_(false) {}
 
-  virtual void SetUp() override {
+  void SetUp() override {
     base::StatisticsRecorder::Initialize();
     Reset();
   }