Add *explicit* keyword to avoid implicit type conversion

Source/bindings/v8/WorkerScriptDebugServer.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 27 matching lines @@
 }
 
 namespace WebCore {
 
 class WorkerGlobalScope;
 class WorkerThread;
 
 class WorkerScriptDebugServer FINAL : public ScriptDebugServer {
     WTF_MAKE_NONCOPYABLE(WorkerScriptDebugServer);
 public:
-    WorkerScriptDebugServer(WorkerGlobalScope*);
+    explicit WorkerScriptDebugServer(WorkerGlobalScope*);
     virtual ~WorkerScriptDebugServer() { }
 
     void addListener(ScriptDebugListener*);
     void removeListener(ScriptDebugListener*);
 
     void interruptAndRunTask(PassOwnPtr<Task>);
 
 private:
     virtual ScriptDebugListener* getDebugListenerForContext(v8::Handle<v8::Context>) OVERRIDE;
     virtual void runMessageLoopOnPause(v8::Handle<v8::Context>) OVERRIDE;
     virtual void quitMessageLoopOnPause() OVERRIDE;
 
     typedef HashMap<WorkerGlobalScope*, ScriptDebugListener*> ListenersMap;
     ScriptDebugListener* m_listener;
     WorkerGlobalScope* m_workerGlobalScope;
 };
 
 } // namespace WebCore
 
 #endif // WorkerScriptDebugServer_h