Add virtual and OVERRIDE to base/ implementation files

base/threading/thread_local_storage_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <process.h>
 #endif
 
 #include "base/threading/simple_thread.h"
@@ skipping 17 matching lines @@
 
 static ThreadLocalStorage::StaticSlot tls_slot = TLS_INITIALIZER;
 
 class ThreadLocalStorageRunner : public DelegateSimpleThread::Delegate {
  public:
   explicit ThreadLocalStorageRunner(int* tls_value_ptr)
       : tls_value_ptr_(tls_value_ptr) {}
 
   virtual ~ThreadLocalStorageRunner() {}
 
-  virtual void Run() {
+  virtual void Run() OVERRIDE {
     *tls_value_ptr_ = kInitialTlsValue;
     tls_slot.Set(tls_value_ptr_);
 
     int *ptr = static_cast<int*>(tls_slot.Get());
     EXPECT_EQ(ptr, tls_value_ptr_);
     EXPECT_EQ(*ptr, kInitialTlsValue);
     *tls_value_ptr_ = 0;
 
     ptr = static_cast<int*>(tls_slot.Get());
     EXPECT_EQ(ptr, tls_value_ptr_);
@@ skipping 56 matching lines @@
     delete threads[index];
     delete thread_delegates[index];
 
     // Verify that the destructor was called and that we reset.
     EXPECT_EQ(values[index], kFinalTlsValue);
   }
   tls_slot.Free();  // Stop doing callbacks to cleanup threads.
 }
 
 }  // namespace base