introduce DocumentParserClient to receive parser stopped notification

Source/core/html/parser/HTMLDocumentParser.cpp

Index: Source/core/html/parser/HTMLDocumentParser.cpp
diff --git a/Source/core/html/parser/HTMLDocumentParser.cpp b/Source/core/html/parser/HTMLDocumentParser.cpp
index 0393a681370b2feae2fe2bb370799479a176539d..711715617e9eb85849c9b775a231362b6a6b99c8 100644
--- a/Source/core/html/parser/HTMLDocumentParser.cpp
+++ b/Source/core/html/parser/HTMLDocumentParser.cpp
@@ -828,6 +828,8 @@ void HTMLDocumentParser::end()
 
     // Informs the the rest of WebCore that parsing is really finished (and deletes this).
     m_treeBuilder->finished();
+
+    DocumentParser::stopParsing();
 }
 
 void HTMLDocumentParser::attemptToRunDeferredScriptsAndEnd()