Standardize usage of virtual/override/final specifiers.

chrome/browser/browsing_data/browsing_data_helper_unittest.cc

Index: chrome/browser/browsing_data/browsing_data_helper_unittest.cc
diff --git a/chrome/browser/browsing_data/browsing_data_helper_unittest.cc b/chrome/browser/browsing_data/browsing_data_helper_unittest.cc
index d5cecdeb89cdd380e7fc60896d5e956452405b7a..55e5e35b25a8a0026a4b65960cadadd1f0d2bb77 100644
--- a/chrome/browser/browsing_data/browsing_data_helper_unittest.cc
+++ b/chrome/browser/browsing_data/browsing_data_helper_unittest.cc
@@ -36,7 +36,7 @@ const int kUnprotected = BrowsingDataHelper::UNPROTECTED_WEB;
 class BrowsingDataHelperTest : public testing::Test {
  public:
   BrowsingDataHelperTest() {}
-  virtual ~BrowsingDataHelperTest() {}
+  ~BrowsingDataHelperTest() override {}
 
   bool IsWebScheme(const std::string& scheme) {
     GURL test(scheme + "://example.com");