More virtual/override updates in base/.

(These aren't built on Mac, only on Linux, hence were missed.)

BUG=417463
[email protected]

Review URL: https://codereview.chromium.org/670013002

Cr-Commit-Position: refs/heads/master@{#300611}
diff --git a/base/message_loop/message_pump_glib.h b/base/message_loop/message_pump_glib.h
index 0f797c51..9f44571 100644
--- a/base/message_loop/message_pump_glib.h
+++ b/base/message_loop/message_pump_glib.h
@@ -22,7 +22,7 @@
 class BASE_EXPORT MessagePumpGlib : public MessagePump {
  public:
   MessagePumpGlib();
-  virtual ~MessagePumpGlib();
+  ~MessagePumpGlib() override;
 
   // Internal methods used for processing the pump callbacks.  They are
   // public for simplicity but should not be used directly.  HandlePrepare
@@ -35,10 +35,10 @@
   void HandleDispatch();
 
   // Overridden from MessagePump:
-  virtual void Run(Delegate* delegate) override;
-  virtual void Quit() override;
-  virtual void ScheduleWork() override;
-  virtual void ScheduleDelayedWork(const TimeTicks& delayed_work_time) override;
+  void Run(Delegate* delegate) override;
+  void Quit() override;
+  void ScheduleWork() override;
+  void ScheduleDelayedWork(const TimeTicks& delayed_work_time) override;
 
  private:
   bool ShouldQuit() const;