Add missing (and remove superfluous) 'explicit' from constructors.

base/timer.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.
 
 #include "base/timer.h"
 
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/platform_thread.h"
 
 namespace base {
 
 // BaseTimerTaskInternal is a simple delegate for scheduling a callback to
 // Timer in the thread's default task runner. It also handles the following
 // edge cases:
 // - deleted by the task runner.
 // - abandoned (orphaned) by Timer.
 class BaseTimerTaskInternal {
  public:
-  BaseTimerTaskInternal(Timer* timer)
+  explicit BaseTimerTaskInternal(Timer* timer)
       : timer_(timer) {
   }
 
   ~BaseTimerTaskInternal() {
     // This task may be getting cleared because the task runner has been
     // destructed.  If so, don't leave Timer with a dangling pointer
     // to this.
     if (timer_)
       timer_->StopAndAbandon();
   }
@@ skipping 145 matching lines @@
     PostNewScheduledTask(delay_);
   else
     Stop();
 
   task.Run();
 
   // No more member accesses here: *this could be deleted at this point.
 }
 
 }  // namespace base