replace OVERRIDE and FINAL with override and final in base/

BUG=417463

Review URL: https://codereview.chromium.org/611153004

Cr-Commit-Position: refs/heads/master@{#298520}


CrOS-Libchrome-Original-Commit: 9e096de10e6fdcafde67df469ed9a6b8b156dfb1
diff --git a/base/message_loop/message_loop.h b/base/message_loop/message_loop.h
index c9a9185..bc98251 100644
--- a/base/message_loop/message_loop.h
+++ b/base/message_loop/message_loop.h
@@ -442,9 +442,9 @@
   void HistogramEvent(int event);
 
   // MessagePump::Delegate methods:
-  virtual bool DoWork() OVERRIDE;
-  virtual bool DoDelayedWork(TimeTicks* next_delayed_work_time) OVERRIDE;
-  virtual bool DoIdleWork() OVERRIDE;
+  virtual bool DoWork() override;
+  virtual bool DoDelayedWork(TimeTicks* next_delayed_work_time) override;
+  virtual bool DoIdleWork() override;
 
   const Type type_;