replace OVERRIDE and FINAL with override and final in base/

base/threading/thread_checker_unittest.cc

Index: base/threading/thread_checker_unittest.cc
diff --git a/base/threading/thread_checker_unittest.cc b/base/threading/thread_checker_unittest.cc
index ae96923e5caab9cc2eb0b76bc4f5314892f231d3..1084dd92d177b32d9c79ada39e877acabd15728b 100644
--- a/base/threading/thread_checker_unittest.cc
+++ b/base/threading/thread_checker_unittest.cc
@@ -52,7 +52,7 @@ class CallDoStuffOnThread : public base::SimpleThread {
         thread_checker_class_(thread_checker_class) {
   }
 
-  virtual void Run() OVERRIDE {
+  virtual void Run() override {
     thread_checker_class_->DoStuff();
   }
 
@@ -71,7 +71,7 @@ class DeleteThreadCheckerClassOnThread : public base::SimpleThread {
         thread_checker_class_(thread_checker_class) {
   }
 
-  virtual void Run() OVERRIDE {
+  virtual void Run() override {
     thread_checker_class_.reset();
   }