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

chrome/browser/policy/policy_browsertest.cc

Index: chrome/browser/policy/policy_browsertest.cc
diff --git a/chrome/browser/policy/policy_browsertest.cc b/chrome/browser/policy/policy_browsertest.cc
index ceb95e014a8692b2481ed2e184f277b3e9e96506..6f242bad51c768d267678d208a11a1c0f25816a6 100644
--- a/chrome/browser/policy/policy_browsertest.cc
+++ b/chrome/browser/policy/policy_browsertest.cc
@@ -849,9 +849,9 @@ class PolicyTest : public InProcessBrowserTest {
 class LocalePolicyTest : public PolicyTest {
  public:
   LocalePolicyTest() {}
-  virtual ~LocalePolicyTest() {}
+  ~LocalePolicyTest() override {}
 
-  virtual void SetUpInProcessBrowserTestFixture() override {
+  void SetUpInProcessBrowserTestFixture() override {
     PolicyTest::SetUpInProcessBrowserTestFixture();
     PolicyMap policies;
     policies.Set(key::kApplicationLocaleValue,