Add #include <algorithm> to code that is missing it.

Source/core/css/CSSSelector.cpp

 /*
  * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
  *               1999 Waldo Bastian (bastian@kde.org)
  *               2001 Andreas Schlapbach (schlpbch@iam.unibe.ch)
  *               2001-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 16 matching lines @@
 #include "core/css/CSSSelector.h"
 
 #include "core/HTMLNames.h"
 #include "core/css/CSSMarkup.h"
 #include "core/css/CSSSelectorList.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "wtf/Assertions.h"
 #include "wtf/HashMap.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/text/StringBuilder.h"
+#include <algorithm>
 
 #ifndef NDEBUG
 #include <stdio.h>
 #endif
 
 namespace blink {
 
 using namespace HTMLNames;
 
 struct SameSizeAsCSSSelector {
@@ skipping 872 matching lines @@
         if (count < nthBValue())
             return false;
         return (count - nthBValue()) % nthAValue() == 0;
     }
     if (count > nthBValue())
         return false;
     return (nthBValue() - count) % (-nthAValue()) == 0;
 }
 
 } // namespace blink