Invoke WorkerScriptLoader's m_finishedCallback callback safely.

Source/web/WebEmbeddedWorkerImpl.cpp

Index: Source/web/WebEmbeddedWorkerImpl.cpp
diff --git a/Source/web/WebEmbeddedWorkerImpl.cpp b/Source/web/WebEmbeddedWorkerImpl.cpp
index 73afc3dc1c0687fdf5afb65d462d9a382b895b09..7f7125d2ec3c4d8a0081deeeb927fccbcdabc146 100644
--- a/Source/web/WebEmbeddedWorkerImpl.cpp
+++ b/Source/web/WebEmbeddedWorkerImpl.cpp
@@ -305,6 +305,8 @@ void WebEmbeddedWorkerImpl::didFinishDocumentLoad(WebLocalFrame* frame)
         DenyCrossOriginRequests,
         nullptr,
         bind(&WebEmbeddedWorkerImpl::onScriptLoaderFinished, this));
+    // Do nothing here since onScriptLoaderFinished() might be already invoked

[haraken, 2015/07/02 06:18:06]

might be => might have been

[Takashi Toyoshima, 2015/07/02 07:33:56]

Oops, tense is so important here.

+    // and |this| might have been deleted at this point.
 }
 
 void WebEmbeddedWorkerImpl::sendProtocolMessage(int callId, const WebString& message, const WebString& state)