Fix potential crash in WebEmbeddedWorkerImpl

Source/web/WebEmbeddedWorkerImpl.cpp

Index: Source/web/WebEmbeddedWorkerImpl.cpp
diff --git a/Source/web/WebEmbeddedWorkerImpl.cpp b/Source/web/WebEmbeddedWorkerImpl.cpp
index 5f7e7194a97a34ac5298063b4c9be289edc4200c..f47349cd08343bc31f2aa7f0e65f192496aeb6d8 100644
--- a/Source/web/WebEmbeddedWorkerImpl.cpp
+++ b/Source/web/WebEmbeddedWorkerImpl.cpp
@@ -218,8 +218,9 @@ void WebEmbeddedWorkerImpl::onScriptLoaderFinished()
     ASSERT(m_mainScriptLoader);
 
     if (m_mainScriptLoader->failed() || m_askedToTerminate) {
-        m_workerContextClient->workerContextFailedToStart();
         m_mainScriptLoader.clear();
+        // This may delete 'this'.
+        m_workerContextClient->workerContextFailedToStart();
         return;
     }