Remove an unneccessary FIXME comment for HTMLToken

Source/core/html/parser/CompactHTMLToken.cpp

Index: Source/core/html/parser/CompactHTMLToken.cpp
diff --git a/Source/core/html/parser/CompactHTMLToken.cpp b/Source/core/html/parser/CompactHTMLToken.cpp
index 4a826e839b3d5c2081f7e010868cb2bd76d510a9..d8c22a14ad4e8a0c26d90d4752226b24da96cb47 100644
--- a/Source/core/html/parser/CompactHTMLToken.cpp
+++ b/Source/core/html/parser/CompactHTMLToken.cpp
@@ -55,7 +55,7 @@ CompactHTMLToken::CompactHTMLToken(const HTMLToken* token, const TextPosition& t
 
         // There is only 1 DOCTYPE token per document, so to avoid increasing the
         // size of CompactHTMLToken, we just use the m_attributes vector.
-        m_attributes.append(Attribute(attemptStaticStringCreation(token->publicIdentifier(), Likely8Bit), String(token->systemIdentifier())));
+        m_attributes.append(Attribute(token->publicIdentifier(), token->systemIdentifier()));
         m_doctypeForcesQuirks = token->forceQuirks();
         break;
     }