Migrate WTF::Vector::append() to ::push_back() in WTF::HexNumber

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.
@@ skipping 59 matching lines @@
   return isCSSTokenizerIdentifier(string.characters16(), length);
 }
 
 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);
+  HexNumber::appendUnsignedAsHex(c, appendTo, HexNumber::Lowercase);
   appendTo.append(' ');
 }
 
 void serializeIdentifier(const String& identifier,
                          StringBuilder& appendTo,
                          bool skipStartChecks) {
   bool isFirst = !skipStartChecks;
   bool isSecond = false;
   bool isFirstCharHyphen = false;
   unsigned index = 0;
@@ skipping 57 matching lines @@
 
 String serializeURI(const String& string) {
   return "url(" + serializeString(string) + ")";
 }
 
 String serializeFontFamily(const String& string) {
   return isCSSTokenizerIdentifier(string) ? string : serializeString(string);
 }
 
 }  // namespace blink