Revert of Remove StringBuilder::appendLiteral.

third_party/WebKit/Source/core/page/EventSource.cpp

 /*
  * Copyright (C) 2009, 2012 Ericsson AB. All rights reserved.
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011, Code Aurora Forum. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1. Redistributions of source code must retain the above copyright
@@ skipping 220 matching lines @@
     m_eventStreamOrigin = SecurityOrigin::create(response.url())->toString();
     int statusCode = response.httpStatusCode();
     bool mimeTypeIsValid = response.mimeType() == "text/event-stream";
     bool responseIsValid = statusCode == 200 && mimeTypeIsValid;
     if (responseIsValid) {
         const String& charset = response.textEncodingName();
         // If we have a charset, the only allowed value is UTF-8 (case-insensitive).
         responseIsValid = charset.isEmpty() || equalIgnoringCase(charset, "UTF-8");
         if (!responseIsValid) {
             StringBuilder message;
-            message.append("EventSource's response has a charset (\"");
+            message.appendLiteral("EventSource's response has a charset (\"");
             message.append(charset);
-            message.append("\") that is not UTF-8. Aborting the connection.");
+            message.appendLiteral("\") that is not UTF-8. Aborting the connection.");
             // FIXME: We are missing the source line.
             getExecutionContext()->addConsoleMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, message.toString()));
         }
     } else {
         // To keep the signal-to-noise ratio low, we only log 200-response with an invalid MIME type.
         if (statusCode == 200 && !mimeTypeIsValid) {
             StringBuilder message;
-            message.append("EventSource's response has a MIME type (\"");
+            message.appendLiteral("EventSource's response has a MIME type (\"");
             message.append(response.mimeType());
-            message.append("\") that is not \"text/event-stream\". Aborting the connection.");
+            message.appendLiteral("\") that is not \"text/event-stream\". Aborting the connection.");
             // FIXME: We are missing the source line.
             getExecutionContext()->addConsoleMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, message.toString()));
         }
     }
 
     if (responseIsValid) {
         m_state = OPEN;
         AtomicString lastEventId;
         if (m_parser) {
             // The new parser takes over the event ID.
@@ skipping 88 matching lines @@
 
 DEFINE_TRACE(EventSource)
 {
     visitor->trace(m_parser);
     EventTargetWithInlineData::trace(visitor);
     ActiveDOMObject::trace(visitor);
     EventSourceParser::Client::trace(visitor);
 }
 
 } // namespace blink