Make quoteCSSString an internal helper

Source/core/css/CSSMarkup.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 141 matching lines @@
             afterEscape = false;
         }
     }
     buffer[index++] = '\'';
 
     ASSERT(quotedStringSize == index);
     return String::adopt(buffer);
 }
 
 // We use single quotes for now because markup.cpp uses double quotes.
-String quoteCSSString(const String& string)
+static String quoteCSSString(const String& string)
 {
     // This function expands each character to at most 3 characters ('\u0010' -> '\' '1' '0') as well as adds
     // 2 quote characters (before and after). Make sure the resulting size (3 * length + 2) will not overflow unsigned.
 
     unsigned length = string.length();
 
     if (!length)
         return String("\'\'");
 
     if (length > std::numeric_limits<unsigned>::max() / 3 - 2)
@@ skipping 68 matching lines @@
             serializeCharacterAsCodePoint(c, appendTo);
         else if (c == 0x22 || c == 0x5c)
             serializeCharacter(c, appendTo);
         else
             appendTo.append(c);
     }
 
     appendTo.append('\"');
 }
 
+String serializeString(const String& string)
+{
+    StringBuilder builder;
+    serializeString(string, builder);
+    return builder.toString();
+}
+
 } // namespace blink