Standardize usage of virtual/override/final specifiers.

content/browser/indexed_db/indexed_db_quota_client_unittest.cc

Index: content/browser/indexed_db/indexed_db_quota_client_unittest.cc
diff --git a/content/browser/indexed_db/indexed_db_quota_client_unittest.cc b/content/browser/indexed_db/indexed_db_quota_client_unittest.cc
index aee11440d1daa8774662e72bf53ec9e660e1fbf9..f0befd24666f6d1136a8b84854e6dbf29ce92631 100644
--- a/content/browser/indexed_db/indexed_db_quota_client_unittest.cc
+++ b/content/browser/indexed_db/indexed_db_quota_client_unittest.cc
@@ -69,7 +69,7 @@ class IndexedDBQuotaClientTest : public testing::Test {
     idb_context()->set_data_path_for_testing(indexeddb_dir);
   }
 
-  virtual ~IndexedDBQuotaClientTest() {
+  ~IndexedDBQuotaClientTest() override {
     FlushIndexedDBTaskRunner();
     idb_context_ = NULL;
     browser_context_.reset();