Update {virtual,override} to follow C++11 style in chrome.

chrome/installer/setup/install_worker_unittest.cc

Index: chrome/installer/setup/install_worker_unittest.cc
diff --git a/chrome/installer/setup/install_worker_unittest.cc b/chrome/installer/setup/install_worker_unittest.cc
index c288549f5de363a9f732721bf54b1da7a74edebd..d47f0424195e4ed113637cc233a7963868755312 100644
--- a/chrome/installer/setup/install_worker_unittest.cc
+++ b/chrome/installer/setup/install_worker_unittest.cc
@@ -491,7 +491,7 @@ const wchar_t old_elevation_key[] =
 class OldIELowRightsTests : public InstallWorkerTest,
   public ::testing::WithParamInterface<std::tr1::tuple<bool, bool> > {
  protected:
-  virtual void SetUp() override {
+  void SetUp() override {
     InstallWorkerTest::SetUp();
 
     const ParamType& param = GetParam();