Remove an unneccessary FIXME comment for HTMLToken

Source/core/html/parser/HTMLConstructionSite.cpp

Index: Source/core/html/parser/HTMLConstructionSite.cpp
diff --git a/Source/core/html/parser/HTMLConstructionSite.cpp b/Source/core/html/parser/HTMLConstructionSite.cpp
index 71d5b6b14c82d65478b48a1f1bd9994033bc47b0..314ce64d30e9c922eb89c1937ab103fad5179916 100644
--- a/Source/core/html/parser/HTMLConstructionSite.cpp
+++ b/Source/core/html/parser/HTMLConstructionSite.cpp
@@ -547,8 +547,8 @@ void HTMLConstructionSite::insertDoctype(AtomicHTMLToken* token)
 {
     ASSERT(token->type() == HTMLToken::DOCTYPE);
 
-    const String& publicId = StringImpl::create8BitIfPossible(token->publicIdentifier());
-    const String& systemId = StringImpl::create8BitIfPossible(token->systemIdentifier());
+    const String& publicId = token->publicIdentifier();
+    const String& systemId = token->systemIdentifier();
     RefPtrWillBeRawPtr<DocumentType> doctype = DocumentType::create(m_document, token->name(), publicId, systemId);
     attachLater(m_attachmentRoot, doctype.release());