Only populate line number in case parsing synchronously.

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 4986 matching lines @@
     if (!isContextThread()) {
         m_taskRunner->postTask(AddConsoleMessageTask::create(consoleMessage->source(), consoleMessage->level(), consoleMessage->message()));
         return;
     }
 
     if (!m_frame)
         return;
 
     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->isParsingAtLineNumber())
                 consoleMessage->setLineNumber(parser->lineNumber().oneBasedInt());
         }
     }
     m_frame->console().addMessage(consoleMessage);
 }
 
 // FIXME(crbug.com/305497): This should be removed after ExecutionContext-LocalDOMWindow migration.
 void Document::postTask(PassOwnPtr<ExecutionContextTask> task)
 {
     m_taskRunner->postTask(task);
@@ skipping 826 matching lines @@
 #ifndef NDEBUG
 using namespace blink;
 void showLiveDocumentInstances()
 {
     WeakDocumentSet& set = liveDocumentSet();
     fprintf(stderr, "There are %u documents currently alive:\n", set.size());
     for (Document* document : set)
         fprintf(stderr, "- Document %p URL: %s\n", document, document->url().string().utf8().data());
 }
 #endif