Demistify DocumentParser::append

Source/core/loader/DocumentWriter.cpp

Index: Source/core/loader/DocumentWriter.cpp
diff --git a/Source/core/loader/DocumentWriter.cpp b/Source/core/loader/DocumentWriter.cpp
index a187c73339b49f2def4a33708229a953eef52453..311794929f64b1c59aebdb8d2cf424cea07bb312 100644
--- a/Source/core/loader/DocumentWriter.cpp
+++ b/Source/core/loader/DocumentWriter.cpp
@@ -79,11 +79,8 @@ void DocumentWriter::appendReplacingData(const String& source)
 
     // FIXME: This should call DocumentParser::appendBytes instead of append
     // to support RawDataDocumentParsers.
-    if (DocumentParser* parser = m_document->parser()) {
-        // Because the parser is pinned to the main thread we don't need to worry about
-        // passing ownership of the source string.
-        parser->append(source.impl());
-    }
+    if (DocumentParser* parser = m_document->parser())
+        parser->append(source);
 }
 
 void DocumentWriter::addData(const char* bytes, size_t length)