Standardize usage of virtual/override/final specifiers.

components/variations/variations_associated_data_unittest.cc

Index: components/variations/variations_associated_data_unittest.cc
diff --git a/components/variations/variations_associated_data_unittest.cc b/components/variations/variations_associated_data_unittest.cc
index 8ca5f1057461ae76f059131404c411097559c98a..4878dcf15cd4259836547a6350ab5e275ae035bf 100644
--- a/components/variations/variations_associated_data_unittest.cc
+++ b/components/variations/variations_associated_data_unittest.cc
@@ -50,7 +50,7 @@ class VariationsAssociatedDataTest : public ::testing::Test {
   VariationsAssociatedDataTest() : field_trial_list_(NULL) {
   }
 
-  virtual ~VariationsAssociatedDataTest() {
+  ~VariationsAssociatedDataTest() override {
     // Ensure that the maps are cleared between tests, since they are stored as
     // process singletons.
     testing::ClearAllVariationIDs();