Standardize usage of virtual/override/final specifiers.

chrome/browser/predictors/resource_prefetch_predictor_unittest.cc

Index: chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
diff --git a/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc b/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
index 675f6dda3ce1bb940d0a940022974452b216cc4c..fba54cacb4efed195ba88cb9fbc9133f023a78cc 100644
--- a/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
+++ b/chrome/browser/predictors/resource_prefetch_predictor_unittest.cc
@@ -72,9 +72,9 @@ class MockResourcePrefetchPredictorTables
 class ResourcePrefetchPredictorTest : public testing::Test {
  public:
   ResourcePrefetchPredictorTest();
-  virtual ~ResourcePrefetchPredictorTest();
-  virtual void SetUp() override;
-  virtual void TearDown() override;
+  ~ResourcePrefetchPredictorTest() override;
+  void SetUp() override;
+  void TearDown() override;
 
  protected:
   void AddUrlToHistory(const std::string& url, int visit_count) {