Rewrite base::Bind into base::BindOnce on trivial cases in base

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 "base/synchronization/condition_variable.h"
 
 #include <time.h>
 
@@ skipping 207 matching lines @@
     PLOG(ERROR) << "Could not set time of day. Run as root?";
     return;
   }
 
   Lock lock;
   ConditionVariable cv(&lock);
   lock.Acquire();
 
   Thread thread("Helper");
   thread.Start();
-  thread.task_runner()->PostTask(FROM_HERE, base::Bind(&BackInTime, &lock));
+  thread.task_runner()->PostTask(FROM_HERE, base::BindOnce(&BackInTime, &lock));
 
   TimeTicks start = TimeTicks::Now();
   const TimeDelta kWaitTime = TimeDelta::FromMilliseconds(300);
   // Allow for clocking rate granularity.
   const TimeDelta kFudgeTime = TimeDelta::FromMilliseconds(50);
 
   cv.TimedWait(kWaitTime + kFudgeTime);
   TimeDelta duration = TimeTicks::Now() - start;
 
   thread.Stop();
@@ skipping 520 matching lines @@
       base::AutoLock auto_lock(lock_);
       // Send notification that we completed our "work."
       WorkIsCompleted(thread_id);
     }
   }
 }
 
 }  // namespace
 
 }  // namespace base