Add virtual and OVERRIDE to base/ implementation files

base/threading/watchdog_unittest.cc

 // Copyright (c) 2011 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.
 
 #include "base/threading/watchdog.h"
 
 #include "base/logging.h"
 #include "base/synchronization/spin_wait.h"
 #include "base/threading/platform_thread.h"
 #include "base/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 namespace {
 
 //------------------------------------------------------------------------------
 // Provide a derived class to facilitate testing.
 
 class WatchdogCounter : public Watchdog {
  public:
   WatchdogCounter(const TimeDelta& duration,
                   const std::string& thread_watched_name,
                   bool enabled)
       : Watchdog(duration, thread_watched_name, enabled), alarm_counter_(0) {
   }
 
   virtual ~WatchdogCounter() {}
 
-  virtual void Alarm() {
+  virtual void Alarm() OVERRIDE {
     alarm_counter_++;
     Watchdog::Alarm();
   }
 
   int alarm_counter() { return alarm_counter_; }
 
  private:
   int alarm_counter_;
 
   DISALLOW_COPY_AND_ASSIGN(WatchdogCounter);
@@ skipping 91 matching lines @@
   // Set a time greater than the timeout into the past.
   watchdog.ArmSomeTimeDeltaAgo(TimeDelta::FromSeconds(10));
   // It should almost instantly go off, but certainly in less than 5 minutes.
   SPIN_FOR_TIMEDELTA_OR_UNTIL_TRUE(TimeDelta::FromMinutes(5),
                                    watchdog.alarm_counter() > 0);
 
   EXPECT_EQ(1, watchdog.alarm_counter());
 }
 
 }  // namespace base