Use <string> serialization rules for computed value of reference filter

third_party/WebKit/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 51 matching lines @@
 
     if (!length)
         return false;
 
     if (string.is8Bit())
         return isCSSTokenizerIdentifier(string.characters8(), length);
     return isCSSTokenizerIdentifier(string.characters16(), length);
 }
 
 template <typename CharacterType>
-static inline bool isCSSTokenizerURL(const CharacterType* characters, unsigned length)
-{
-    const CharacterType* end = characters + length;
-
-    for (; characters != end; ++characters) {
-        CharacterType c = characters[0];
-        switch (c) {
-        case '!':
-        case '#':
-        case '$':
-        case '%':
-        case '&':
-            break;
-        default:
-            if (c < '*')
-                return false;
-            if (c <= '~')
-                break;
-            if (c < 128)
-                return false;
-        }
-    }
-
-    return true;
-}
-
-// "url" from the CSS tokenizer, minus backslash-escape sequences
-static bool isCSSTokenizerURL(const String& string)
-{
-    unsigned length = string.length();
-
-    if (!length)
-        return true;
-
-    if (string.is8Bit())
-        return isCSSTokenizerURL(string.characters8(), length);
-    return isCSSTokenizerURL(string.characters16(), length);
-}
-
-template <typename CharacterType>
 static inline String quoteCSSStringInternal(const CharacterType* characters, unsigned length)
 {
     // For efficiency, we first pre-calculate the length of the quoted string, then we build the actual one.
     // Please see below for the actual logic.
     unsigned quotedStringSize = 2; // Two quotes surrounding the entire string.
     bool afterEscape = false;
     for (unsigned i = 0; i < length; ++i) {
         CharacterType ch = characters[i];
         if (ch == '\\' || ch == '\'') {
             quotedStringSize += 2;
@@ skipping 52 matching lines @@
     if (string.is8Bit())
         return quoteCSSStringInternal(string.characters8(), length);
     return quoteCSSStringInternal(string.characters16(), length);
 }
 
 String quoteCSSStringIfNeeded(const String& string)
 {
     return isCSSTokenizerIdentifier(string) ? string : quoteCSSString(string);
 }
 
-String quoteCSSURLIfNeeded(const String& string)
-{
-    return isCSSTokenizerURL(string) ? string : quoteCSSString(string);
-}
-
 static void serializeCharacter(UChar32 c, StringBuilder& appendTo)
 {
     appendTo.append('\\');
     appendTo.append(c);
 }
 
 static void serializeCharacterAsCodePoint(UChar32 c, StringBuilder& appendTo)
 {
     appendTo.append('\\');
     appendUnsignedAsHex(c, appendTo, Lowercase);
@@ skipping 61 matching lines @@
     serializeString(string, builder);
     return builder.toString();
 }
 
 String serializeURI(const String& string)
 {
     return "url(" + serializeString(string) + ")";
 }
 
 } // namespace blink