Only populate line number in case parsing synchronously.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 5a09d1d367578cc53657d00fa5ce5ccae1876ee8..f31f5c675cd493afd0f8a4de76ddcb49a7e61016 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -5004,9 +5004,9 @@ void Document::addConsoleMessage(PassRefPtrWillBeRawPtr<ConsoleMessage> consoleM
 
     if (!consoleMessage->scriptState() && consoleMessage->url().isNull() && !consoleMessage->lineNumber()) {
         consoleMessage->setURL(url().string());
-        if (!consoleMessage->isAsync() && parsing() && !isInDocumentWrite() && scriptableDocumentParser()) {
+        if (!isInDocumentWrite() && scriptableDocumentParser()) {
             ScriptableDocumentParser* parser = scriptableDocumentParser();
-            if (!parser->isWaitingForScripts() && !parser->isExecutingScript())
+            if (parser->hasLineNumber() && !parser->isWaitingForScripts() && !parser->isExecutingScript())
                 consoleMessage->setLineNumber(parser->lineNumber().oneBasedInt());
         }
     }