Update {virtual,override,final} to follow C++11 style chrome/browser/chromeos/net.

chrome/browser/chromeos/net/network_portal_detector_impl_browsertest.cc

Index: chrome/browser/chromeos/net/network_portal_detector_impl_browsertest.cc
diff --git a/chrome/browser/chromeos/net/network_portal_detector_impl_browsertest.cc b/chrome/browser/chromeos/net/network_portal_detector_impl_browsertest.cc
index b34cf1ee7c1170726bd7f79d5a03c90d46c75115..491b80a1b54eeccc3ef70977681f31af33c22c58 100644
--- a/chrome/browser/chromeos/net/network_portal_detector_impl_browsertest.cc
+++ b/chrome/browser/chromeos/net/network_portal_detector_impl_browsertest.cc
@@ -61,25 +61,22 @@ class TestObserver : public MessageCenterObserver {
     MessageCenter::Get()->AddObserver(this);
   }
 
-  virtual ~TestObserver() {
-    MessageCenter::Get()->RemoveObserver(this);
-  }
+  ~TestObserver() override { MessageCenter::Get()->RemoveObserver(this); }
 
   void WaitAndReset() {
     run_loop_->Run();
     run_loop_.reset(new base::RunLoop());
   }
 
-  virtual void OnNotificationDisplayed(
+  void OnNotificationDisplayed(
       const std::string& notification_id,
-      const message_center::DisplaySource source)
-      override {
+      const message_center::DisplaySource source) override {
     if (notification_id == kNotificationId)
       MessageLoop::current()->PostTask(FROM_HERE, run_loop_->QuitClosure());
   }
 
-  virtual void OnNotificationRemoved(const std::string& notification_id,
-                                     bool by_user) override {
+  void OnNotificationRemoved(const std::string& notification_id,
+                             bool by_user) override {
     if (notification_id == kNotificationId && by_user)
       MessageLoop::current()->PostTask(FROM_HERE, run_loop_->QuitClosure());
   }
@@ -98,9 +95,9 @@ class NetworkPortalDetectorImplBrowserTest
  public:
   NetworkPortalDetectorImplBrowserTest()
       : LoginManagerTest(false), network_portal_detector_(NULL) {}
-  virtual ~NetworkPortalDetectorImplBrowserTest() {}
+  ~NetworkPortalDetectorImplBrowserTest() override {}
 
-  virtual void SetUpOnMainThread() override {
+  void SetUpOnMainThread() override {
     LoginManagerTest::SetUpOnMainThread();
 
     ShillServiceClient::TestInterface* service_test =