Standardize usage of virtual/override/final specifiers.

chrome/browser/browsing_data/browsing_data_remover_unittest.cc

Index: chrome/browser/browsing_data/browsing_data_remover_unittest.cc
diff --git a/chrome/browser/browsing_data/browsing_data_remover_unittest.cc b/chrome/browser/browsing_data/browsing_data_remover_unittest.cc
index 42fd466132ae25270060df467730a354d438d78f..e8b895dfb4b1ca73ddfcdb53a7029e89e2ca869d 100644
--- a/chrome/browser/browsing_data/browsing_data_remover_unittest.cc
+++ b/chrome/browser/browsing_data/browsing_data_remover_unittest.cc
@@ -703,10 +703,9 @@ class BrowsingDataRemoverTest : public testing::Test,
                    content::Source<Profile>(profile_.get()));
   }
 
-  virtual ~BrowsingDataRemoverTest() {
-  }
+  ~BrowsingDataRemoverTest() override {}
 
-  virtual void TearDown() {
+  void TearDown() override {
 #if defined(ENABLE_EXTENSIONS)
     mock_policy_ = NULL;
 #endif