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

content/browser/geolocation/core_location_provider_mac.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.
 
 // This file declares a CoreLocation provider that runs on Mac OS X (10.6).
 // Public for testing only - for normal usage this  header should not be
 // required, as location_provider.h declares the needed factory function.
 
 #ifndef CONTENT_BROWSER_GEOLOCATION_CORE_LOCATION_PROVIDER_MAC_H_
 #define CONTENT_BROWSER_GEOLOCATION_CORE_LOCATION_PROVIDER_MAC_H_
 
 #include "content/browser/geolocation/location_provider.h"
 #include "content/public/common/geoposition.h"
 
 namespace content {
 class CoreLocationDataProviderMac;
 
 class CoreLocationProviderMac : public LocationProviderBase {
  public:
-  explicit CoreLocationProviderMac();
+  CoreLocationProviderMac();
   virtual ~CoreLocationProviderMac();
 
   // LocationProvider
   virtual bool StartProvider(bool high_accuracy) OVERRIDE;
   virtual void StopProvider() OVERRIDE;
   virtual void GetPosition(Geoposition* position) OVERRIDE;
 
   // Receives new positions and calls UpdateListeners
   void SetPosition(Geoposition* position);
 
  private:
   bool is_updating_;
   CoreLocationDataProviderMac* data_provider_;
   Geoposition position_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_GEOLOCATION_CORE_LOCATION_PROVIDER_MAC_H_