Avoid leaking a shared worker global scope on a failed script load.

Source/web/WebSharedWorkerImpl.cpp

Index: Source/web/WebSharedWorkerImpl.cpp
diff --git a/Source/web/WebSharedWorkerImpl.cpp b/Source/web/WebSharedWorkerImpl.cpp
index ac6d7069f343c3175685570f64621c55804083a7..b36029b4be8659ac126feb7ecafe6085d614ab0c 100644
--- a/Source/web/WebSharedWorkerImpl.cpp
+++ b/Source/web/WebSharedWorkerImpl.cpp
@@ -177,8 +177,10 @@ void WebSharedWorkerImpl::stopWorkerThread()
     if (m_askedToTerminate)
         return;
     m_askedToTerminate = true;
-    if (m_mainScriptLoader)
+    if (m_mainScriptLoader) {
         m_mainScriptLoader->cancel();
+        m_mainScriptLoader.clear();
+    }
     if (m_workerThread)
         m_workerThread->stop();
 }
@@ -344,9 +346,16 @@ void WebSharedWorkerImpl::onScriptLoaderFinished()
     ASSERT(m_loadingDocument);
     ASSERT(m_mainScriptLoader);
     if (m_mainScriptLoader->failed() || m_askedToTerminate) {
-        m_mainScriptLoader.clear();
+        m_mainScriptLoader->cancel();
         if (client())
             client()->workerScriptLoadFailed();
+
+        // The SharedWorker was unable to load the initial script, so
+        // shut it down right here unless we're here handling a load
+        // cancellation failure triggered by an explicit shared worker
+        // termination call (via terminateWorkerContext().)
+        if (!m_askedToTerminate)
+            delete this;
         return;
     }
     WorkerThreadStartMode startMode = m_pauseWorkerContextOnStart ? PauseWorkerGlobalScopeOnStart : DontPauseWorkerGlobalScopeOnStart;