Standardize usage of virtual/override/final in content/

content/child/quota_dispatcher.h

Index: content/child/quota_dispatcher.h
diff --git a/content/child/quota_dispatcher.h b/content/child/quota_dispatcher.h
index 7e9737385ed031374a387486cb44e1f0e9828ba7..f4111e6245fb3840cdce96bf5e61dad34b356f38 100644
--- a/content/child/quota_dispatcher.h
+++ b/content/child/quota_dispatcher.h
@@ -45,7 +45,7 @@ class QuotaDispatcher : public WorkerTaskRunner::Observer {
 
   QuotaDispatcher(ThreadSafeSender* thread_safe_sender,
                   QuotaMessageFilter* quota_message_filter);
-  virtual ~QuotaDispatcher();
+  ~QuotaDispatcher() override;
 
   // |thread_safe_sender| and |quota_message_filter| are used if
   // calling this leads to construction.
@@ -54,7 +54,7 @@ class QuotaDispatcher : public WorkerTaskRunner::Observer {
       QuotaMessageFilter* quota_message_filter);
 
   // WorkerTaskRunner::Observer implementation.
-  virtual void OnWorkerRunLoopStopped() override;
+  void OnWorkerRunLoopStopped() override;
 
   void OnMessageReceived(const IPC::Message& msg);