Standardize usage of virtual/override/final specifiers.

chrome/browser/sync/test/integration/sync_auth_test.cc

Index: chrome/browser/sync/test/integration/sync_auth_test.cc
diff --git a/chrome/browser/sync/test/integration/sync_auth_test.cc b/chrome/browser/sync/test/integration/sync_auth_test.cc
index 0f958c2467fc5a0a6ea542bbd18f0555a031c899..0c625e9a507acbcaa39ac11f725298790c608c37 100644
--- a/chrome/browser/sync/test/integration/sync_auth_test.cc
+++ b/chrome/browser/sync/test/integration/sync_auth_test.cc
@@ -73,7 +73,7 @@ std::string TestForAuthError::GetDebugMessage() const {
 class SyncAuthTest : public SyncTest {
  public:
   SyncAuthTest() : SyncTest(SINGLE_CLIENT), bookmark_index_(0) {}
-  virtual ~SyncAuthTest() {}
+  ~SyncAuthTest() override {}
 
   // Helper function that adds a bookmark and waits for either an auth error, or
   // for the bookmark to be committed.  Returns true if it detects an auth