Allow sites to enable 'window.onerror' handlers for cross-domain scripts.

Source/core/workers/WorkerMessagingProxy.cpp

Index: Source/core/workers/WorkerMessagingProxy.cpp
diff --git a/Source/core/workers/WorkerMessagingProxy.cpp b/Source/core/workers/WorkerMessagingProxy.cpp
index a9404196326a934b4988c8eda1a29d428784eb9f..eb15b16300e52c8e942f25e9a4bfb450551859f0 100644
--- a/Source/core/workers/WorkerMessagingProxy.cpp
+++ b/Source/core/workers/WorkerMessagingProxy.cpp
@@ -141,7 +141,7 @@ private:
         RefPtr<ErrorEvent> event = ErrorEvent::create(m_errorMessage, m_sourceURL, m_lineNumber, m_columnNumber);
         bool errorHandled = !workerObject->dispatchEvent(event);
         if (!errorHandled)
-            context->reportException(event, 0);
+            context->reportException(event, 0, NotSharableCrossOrigin);
     }
 
     String m_errorMessage;