Add virtual and OVERRIDE to base/ implementation files

base/synchronization/condition_variable_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.
 
 // Multi-threaded tests of ConditionVariable class.
 
 #include <time.h>
 #include <algorithm>
 #include <vector>
 
@@ skipping 44 matching lines @@
 // cases will validate that the WorkQueue has records showing that the desired
 // activities were performed.
 //------------------------------------------------------------------------------
 
 // Callers are responsible for synchronizing access to the following class.
 // The WorkQueue::lock_, as accessed via WorkQueue::lock(), should be used for
 // all synchronized access.
 class WorkQueue : public PlatformThread::Delegate {
  public:
   explicit WorkQueue(int thread_count);
-  ~WorkQueue();
+  virtual ~WorkQueue();
 
   // PlatformThread::Delegate interface.
-  void ThreadMain();
+  virtual void ThreadMain() OVERRIDE;
 
   //----------------------------------------------------------------------------
   // Worker threads only call the following methods.
   // They should use the lock to get exclusive access.
   int GetThreadId();  // Get an ID assigned to a thread..
   bool EveryIdWasAllocated() const;  // Indicates that all IDs were handed out.
   TimeDelta GetAnAssignment(int thread_id);  // Get a work task duration.
   void WorkIsCompleted(int thread_id);
 
   int task_count() const;
@@ skipping 627 matching lines @@
       base::AutoLock auto_lock(lock_);
       // Send notification that we completed our "work."
       WorkIsCompleted(thread_id);
     }
   }
 }
 
 }  // namespace
 
 }  // namespace base