Make DOMParser::parseFromString specification compliant and throw exception in error scenario.

Source/core/xml/DOMParser.h

Index: Source/core/xml/DOMParser.h
diff --git a/Source/core/xml/DOMParser.h b/Source/core/xml/DOMParser.h
index 020debaa4b8c8f72cf07207d493744e80f2b2c42..afe0d16433ce5ec935e5e4dce6c0c40c78a8da3d 100644
--- a/Source/core/xml/DOMParser.h
+++ b/Source/core/xml/DOMParser.h
@@ -27,12 +27,13 @@
 namespace WebCore {
 
 class Document;
+class ExceptionState;
 
 class DOMParser : public RefCounted<DOMParser>, public ScriptWrappable {
 public:
     static PassRefPtr<DOMParser> create() { return adoptRef(new DOMParser); }
 
-    PassRefPtr<Document> parseFromString(const String&, const String& contentType);
+    PassRefPtr<Document> parseFromString(const String&, const String& contentType, ExceptionState&);
 
 private:
     DOMParser()