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

chrome/browser/ui/webui/options/preferences_browsertest.h

Index: chrome/browser/ui/webui/options/preferences_browsertest.h
diff --git a/chrome/browser/ui/webui/options/preferences_browsertest.h b/chrome/browser/ui/webui/options/preferences_browsertest.h
index 86ae2c46eb6ee451e0bf559116a66a2d0fd78f68..eeb13b58a48a8602ec980a72258e84e5835fea8d 100644
--- a/chrome/browser/ui/webui/options/preferences_browsertest.h
+++ b/chrome/browser/ui/webui/options/preferences_browsertest.h
@@ -36,10 +36,10 @@ class RenderViewHost;
 class PreferencesBrowserTest : public InProcessBrowserTest {
  public:
   PreferencesBrowserTest();
-  ~PreferencesBrowserTest();
+  ~PreferencesBrowserTest() override;
 
   // InProcessBrowserTest implementation:
-  virtual void SetUpOnMainThread() override;
+  void SetUpOnMainThread() override;
 
   void OnPreferenceChanged(const std::string& pref_name);
 
@@ -49,7 +49,7 @@ class PreferencesBrowserTest : public InProcessBrowserTest {
   void SetUpPrefs();
 
   // InProcessBrowserTest implementation:
-  virtual void SetUpInProcessBrowserTestFixture() override;
+  void SetUpInProcessBrowserTestFixture() override;
 
   // Sets user policies through the mock policy provider.
   void SetUserPolicies(const std::vector<std::string>& names,