Use StringBuilder::appendLiteral() / StringBuilder::append(char) when possible

Source/core/html/ImageDocument.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2010 Apple Inc. 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
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 90 matching lines @@
 static float pageZoomFactor(const Document* document)
 {
     LocalFrame* frame = document->frame();
     return frame ? frame->pageZoomFactor() : 1;
 }
 
 static String imageTitle(const String& filename, const IntSize& size)
 {
     StringBuilder result;
     result.append(filename);
-    result.append(" (");
+    result.appendLiteral(" (");
     // FIXME: Localize numbers. Safari/OSX shows localized numbers with group
     // separaters. For example, "1,920x1,080".
     result.append(String::number(size.width()));
     result.append(static_cast<UChar>(0xD7)); // U+00D7 (multiplication sign)
     result.append(String::number(size.height()));
     result.append(')');
     return result.toString();
 }
 
 void ImageDocumentParser::appendBytes(const char* data, size_t length)
@@ skipping 271 matching lines @@
 }
 
 bool ImageEventListener::operator==(const EventListener& listener)
 {
     if (const ImageEventListener* imageEventListener = ImageEventListener::cast(&listener))
         return m_doc == imageEventListener->m_doc;
     return false;
 }
 
 }