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

chrome/browser/extensions/api/alarms/alarm_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_ALARMS_ALARM_MANAGER_H__
 #define CHROME_BROWSER_EXTENSIONS_API_ALARMS_ALARM_MANAGER_H__
 
 #include <string>
 #include <map>
 #include <vector>
@@ skipping 41 matching lines @@
 
   class Delegate {
    public:
     virtual ~Delegate() {}
     // Called when an alarm fires.
     virtual void OnAlarm(const std::string& extension_id,
                          const Alarm& alarm) = 0;
   };
 
   // 'now' is usually &base::Time::Now.
-  explicit AlarmManager(Profile* profile, TimeProvider now);
+  AlarmManager(Profile* profile, TimeProvider now);
   virtual ~AlarmManager();
 
   // Override the default delegate. Callee assumes onwership. Used for testing.
   void set_delegate(Delegate* delegate) { delegate_.reset(delegate); }
 
   // Adds |alarm| for the given extension, and starts the timer.
   void AddAlarm(const std::string& extension_id,
                 const Alarm& alarm);
 
   // Returns the alarm with the given name, or NULL if none exists.
@@ skipping 77 matching lines @@
   // The previous and next time that alarms were and will be run.
   base::Time last_poll_time_;
   base::Time next_poll_time_;
 
   DISALLOW_COPY_AND_ASSIGN(AlarmManager);
 };
 
 }  //  namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_ALARMS_ALARM_MANAGER_H__