Disallow cross-thread Persistent<> read access.

third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp

Index: third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp b/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
index dfc21de6f498c90ef51048b6a6e16ff80f800a86..47e1ed2dff6304748a02fadadb66196a4f644d33 100644
--- a/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
+++ b/third_party/WebKit/Source/web/WebSharedWorkerImpl.cpp
@@ -353,7 +353,7 @@ void WebSharedWorkerImpl::startWorkerContext(
 
 void WebSharedWorkerImpl::didReceiveScriptLoaderResponse() {
   InspectorInstrumentation::didReceiveScriptResponse(
-      m_loadingDocument.get(), m_mainScriptLoader->identifier());
+      m_loadingDocument, m_mainScriptLoader->identifier());
   m_client->selectAppCacheID(m_mainScriptLoader->appCacheID());
 }
 
@@ -415,14 +415,14 @@ void WebSharedWorkerImpl::onScriptLoaderFinished() {
   m_loaderProxy = WorkerLoaderProxy::create(this);
   m_workerThread = SharedWorkerThread::create(m_name, m_loaderProxy, *this,
                                               m_parentFrameTaskRunners.get());
-  InspectorInstrumentation::scriptImported(m_loadingDocument.get(),
+  InspectorInstrumentation::scriptImported(m_loadingDocument,
                                            m_mainScriptLoader->identifier(),
                                            m_mainScriptLoader->script());
   m_mainScriptLoader.clear();
 
   workerThread()->start(std::move(startupData));
-  m_workerInspectorProxy->workerThreadCreated(
-      toDocument(m_loadingDocument.get()), workerThread(), m_url);
+  m_workerInspectorProxy->workerThreadCreated(toDocument(m_loadingDocument),
+                                              workerThread(), m_url);
   m_client->workerScriptLoaded();
 }