replace OVERRIDE and FINAL with override and final in base/

base/threading/non_thread_safe_unittest.cc

Index: base/threading/non_thread_safe_unittest.cc
diff --git a/base/threading/non_thread_safe_unittest.cc b/base/threading/non_thread_safe_unittest.cc
index 8a82a637ab781f9e694ef5b23fd4c640b759d60e..2bd76292a82791287960a6ec23046b208a691294 100644
--- a/base/threading/non_thread_safe_unittest.cc
+++ b/base/threading/non_thread_safe_unittest.cc
@@ -52,7 +52,7 @@ class CallDoStuffOnThread : public SimpleThread {
         non_thread_safe_class_(non_thread_safe_class) {
   }
 
-  virtual void Run() OVERRIDE {
+  virtual void Run() override {
     non_thread_safe_class_->DoStuff();
   }
 
@@ -71,7 +71,7 @@ class DeleteNonThreadSafeClassOnThread : public SimpleThread {
         non_thread_safe_class_(non_thread_safe_class) {
   }
 
-  virtual void Run() OVERRIDE {
+  virtual void Run() override {
     non_thread_safe_class_.reset();
   }