Style cleanup in preparation for auto-linting base/.

base/timer.h

 // Copyright (c) 2006-2008 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.
 
 // OneShotTimer and RepeatingTimer provide a simple timer API.  As the names
 // suggest, OneShotTimer calls you back once after a time delay expires.
 // RepeatingTimer on the other hand calls you back periodically with the
 // prescribed time interval.
 //
 // OneShotTimer and RepeatingTimer both cancel the timer when they go out of
@@ skipping 67 matching lines @@
     DCHECK(IsRunning());
     return delayed_task_->delay_;
   }
 
  protected:
   BaseTimer_Helper() : delayed_task_(NULL) {}
 
   // We have access to the timer_ member so we can orphan this task.
   class TimerTask : public Task {
    public:
-    TimerTask(TimeDelta delay) : timer_(NULL), delay_(delay) {
+    explicit TimerTask(TimeDelta delay) : timer_(NULL), delay_(delay) {
     }
     virtual ~TimerTask() {}
     BaseTimer_Helper* timer_;
     TimeDelta delay_;
   };
 
   // Used to orphan delayed_task_ so that when it runs it does nothing.
   void OrphanDelayedTask();
 
   // Used to initiated a new delayed task.  This has the side-effect of
@@ skipping 162 matching lines @@
   const ReceiverMethod method_;
   const TimeDelta delay_;
 
   OneShotTimer<DelayTimer<Receiver> > timer_;
   Time trigger_time_;
 };
 
 }  // namespace base
 
 #endif  // BASE_TIMER_H_