Standardize usage of virtual/override/final in net/

net/spdy/spdy_session_test_util.h

Index: net/spdy/spdy_session_test_util.h
diff --git a/net/spdy/spdy_session_test_util.h b/net/spdy/spdy_session_test_util.h
index cc3f136679f71de3da27e571603ba61ceab4e268..dcb173396329e6330814747b2533e2ee44f90c93 100644
--- a/net/spdy/spdy_session_test_util.h
+++ b/net/spdy/spdy_session_test_util.h
@@ -26,11 +26,11 @@ class SpdySessionTestTaskObserver : public base::MessageLoop::TaskObserver {
   //  function = "DoFoo"
   SpdySessionTestTaskObserver(const std::string& file_name,
                               const std::string& function_name);
-  virtual ~SpdySessionTestTaskObserver();
+  ~SpdySessionTestTaskObserver() override;
 
   // Implements MessageLoop::TaskObserver.
-  virtual void WillProcessTask(const base::PendingTask& pending_task) override;
-  virtual void DidProcessTask(const base::PendingTask& pending_task) override;
+  void WillProcessTask(const base::PendingTask& pending_task) override;
+  void DidProcessTask(const base::PendingTask& pending_task) override;
 
   // Returns the number of tasks posted by the given function and file.
   uint16 executed_count() const { return executed_count_; }