Update {virtual,override,final} to follow C++11 style in content, round 2.

content/browser/time_zone_monitor_chromeos.cc

Index: content/browser/time_zone_monitor_chromeos.cc
diff --git a/content/browser/time_zone_monitor_chromeos.cc b/content/browser/time_zone_monitor_chromeos.cc
index 8c6aa0bd0a3466724653afd004871f35f85b5d93..7ad81789bcabbde2a46709dbf5f4e36cb9cc9baf 100644
--- a/content/browser/time_zone_monitor_chromeos.cc
+++ b/content/browser/time_zone_monitor_chromeos.cc
@@ -16,12 +16,12 @@ class TimeZoneMonitorChromeOS
     chromeos::system::TimezoneSettings::GetInstance()->AddObserver(this);
   }
 
-  virtual ~TimeZoneMonitorChromeOS() {
+  ~TimeZoneMonitorChromeOS() override {
     chromeos::system::TimezoneSettings::GetInstance()->RemoveObserver(this);
   }
 
   // chromeos::system::TimezoneSettings::Observer implementation.
-  virtual void TimezoneChanged(const icu::TimeZone& time_zone) override {
+  void TimezoneChanged(const icu::TimeZone& time_zone) override {
     NotifyRenderers();
   }