Make ThreadableLoader class to use references

Source/core/workers/WorkerScriptLoader.cpp

Index: Source/core/workers/WorkerScriptLoader.cpp
diff --git a/Source/core/workers/WorkerScriptLoader.cpp b/Source/core/workers/WorkerScriptLoader.cpp
index ba33a8bca24cc0758143aa9a305e5f4c5ad7cdb6..e27820fee45b044e50cce4b57e78ff7f652376ad 100644
--- a/Source/core/workers/WorkerScriptLoader.cpp
+++ b/Source/core/workers/WorkerScriptLoader.cpp
@@ -69,7 +69,7 @@ void WorkerScriptLoader::loadSynchronously(ExecutionContext* executionContext, c
     // FIXME: Should we add EnforceScriptSrcDirective here?
     options.contentSecurityPolicyEnforcement = DoNotEnforceContentSecurityPolicy;
 
-    WorkerThreadableLoader::loadResourceSynchronously(toWorkerGlobalScope(executionContext), *request, *this, options);
+    WorkerThreadableLoader::loadResourceSynchronously(toWorkerGlobalScope(*executionContext), *request, *this, options);
 }
 
 void WorkerScriptLoader::loadAsynchronously(ExecutionContext* executionContext, const KURL& url, CrossOriginRequestPolicy crossOriginRequestPolicy, WorkerScriptLoaderClient* client)
@@ -88,7 +88,7 @@ void WorkerScriptLoader::loadAsynchronously(ExecutionContext* executionContext,
 
     // During create, callbacks may happen which remove the last reference to this object.
     RefPtr<WorkerScriptLoader> protect(this);
-    m_threadableLoader = ThreadableLoader::create(executionContext, this, *request, options);
+    m_threadableLoader = ThreadableLoader::create(*executionContext, this, *request, options);
 }
 
 const KURL& WorkerScriptLoader::responseURL() const