Missing explicit keyword in ctor of FooImpl.h

Source/web/UserMediaClientImpl.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 28 matching lines @@
 class UserMediaRequest;
 }
 
 namespace blink {
 
 class WebUserMediaClient;
 class WebLocalFrameImpl;
 
 class UserMediaClientImpl FINAL : public blink::UserMediaClient {
 public:
-    UserMediaClientImpl(WebLocalFrameImpl*);
+    explicit UserMediaClientImpl(WebLocalFrameImpl*);
 
     // blink::UserMediaClient ----------------------------------------------
     virtual void requestUserMedia(blink::UserMediaRequest*) OVERRIDE;
     virtual void cancelUserMediaRequest(blink::UserMediaRequest*) OVERRIDE;
     virtual void requestMediaDevices(blink::MediaDevicesRequest*) OVERRIDE;
     virtual void cancelMediaDevicesRequest(blink::MediaDevicesRequest*) OVERRIDE;
 
 private:
     UserMediaClientImpl();
 
     WebUserMediaClient* m_client;
 };
 
 } // namespace blink
 
 #endif // UserMediaClientImpl_h