DevTools: do not enable debugger for pages where script execution is prohibited

Source/core/inspector/WorkerDebuggerAgent.cpp

 /*
  * 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 71 matching lines @@
 {
     visitor->trace(m_inspectedWorkerGlobalScope);
     InspectorDebuggerAgent::trace(visitor);
 }
 
 void WorkerDebuggerAgent::interruptAndDispatchInspectorCommands()
 {
     scriptDebugServer().interruptAndRun(adoptPtr(new RunInspectorCommandsTask(m_inspectedWorkerGlobalScope->thread())));
 }
 
-void WorkerDebuggerAgent::startListeningScriptDebugServer()
+bool WorkerDebuggerAgent::startListeningScriptDebugServer()
 {
     scriptDebugServer().addListener(this);
+    return true;
 }
 
 void WorkerDebuggerAgent::stopListeningScriptDebugServer()
 {
     scriptDebugServer().removeListener(this);
 }
 
 WorkerScriptDebugServer& WorkerDebuggerAgent::scriptDebugServer()
 {
     return *m_scriptDebugServer;
@@ skipping 14 matching lines @@
 {
     // We don't need to mute console for workers.
 }
 
 void WorkerDebuggerAgent::unmuteConsole()
 {
     // We don't need to mute console for workers.
 }
 
 } // namespace blink