remove DocumentParser::startParsing()

Source/core/dom/DocumentParser.h

Index: Source/core/dom/DocumentParser.h
diff --git a/Source/core/dom/DocumentParser.h b/Source/core/dom/DocumentParser.h
index ea60da08c11294a7e42120080138ef1c9a5df4dc..83de2a4c95d46b014425dfdca6c1882c476df7b2 100644
--- a/Source/core/dom/DocumentParser.h
+++ b/Source/core/dom/DocumentParser.h
@@ -79,9 +79,6 @@ public:
     bool isStopped() const { return m_state >= StoppedState; }
     bool isDetached() const { return m_state == DetachedState; }
 
-    // FIXME: Is this necessary? Does XMLDocumentParserLibxml2 really need to set this?
-    virtual void startParsing();
-
     // prepareToStop() is used when the EOF token is encountered and parsing is to be
     // stopped normally.
     virtual void prepareToStopParsing();