Revert of Add a parser for Link headers

Source/core/loader/LinkHeader.cpp

Index: Source/core/loader/LinkHeader.cpp
diff --git a/Source/core/loader/LinkHeader.cpp b/Source/core/loader/LinkHeader.cpp
deleted file mode 100644
index ec6d2e955c7d8b9cc57bd85c1d87fb65ca567823..0000000000000000000000000000000000000000
--- a/Source/core/loader/LinkHeader.cpp
+++ /dev/null
@@ -1,198 +0,0 @@
-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "config.h"
-#include "core/loader/LinkHeader.h"
-
-#include "platform/ParsingUtilities.h"
-
-namespace blink {
-
-// LWSP definition in https://www.ietf.org/rfc/rfc0822.txt
-template <typename CharType>
-static bool isWhitespace(CharType chr)
-{
-    return (chr == ' ') || (chr == '\t');
-}
-
-template <typename CharType>
-static bool isValidURLChar(CharType chr)
-{
-    return !isWhitespace(chr) && chr != '>';
-}
-
-template <typename CharType>
-static bool isValidParameterNameChar(CharType chr)
-{
-    return !isWhitespace(chr) && chr != '=';
-}
-
-template <typename CharType>
-static bool isValidParameterValueChar(CharType chr)
-{
-    return !isWhitespace(chr) && chr != ';';
-}
-
-// Before:
-//
-// <cat.jpg>; rel=preload
-// ^                     ^
-// position              end
-//
-// After (if successful: otherwise the method returns false)
-//
-// <cat.jpg>; rel=preload
-//          ^            ^
-//          position     end
-template <typename CharType>
-static bool parseURL(CharType*& position, CharType* end, String& url)
-{
-    skipWhile<CharType, isWhitespace>(position, end);
-    if (!skipExactly<CharType>(position, end, '<'))
-        return false;
-    skipWhile<CharType, isWhitespace>(position, end);
-
-    CharType* urlStart = position;
-    skipWhile<CharType, isValidURLChar>(position, end);
-    CharType* urlEnd = position;
-    skipUntil<CharType>(position, end, '>');
-    if (!skipExactly<CharType>(position, end, '>'))
-        return false;
-
-    url = String(urlStart, urlEnd - urlStart);
-    return true;
-}
-
-// Before:
-//
-// <cat.jpg>; rel=preload
-//          ^            ^
-//          position     end
-//
-// After (if successful: otherwise the method returns false, and modifies the isValid boolean accordingly)
-//
-// <cat.jpg>; rel=preload
-//            ^          ^
-//            position  end
-template <typename CharType>
-static bool parseParameterDelimiter(CharType*& position, CharType* end, bool& isValidDelimiter)
-{
-    isValidDelimiter = true;
-    skipWhile<CharType, isWhitespace>(position, end);
-    if (!skipExactly<CharType>(position, end, ';') && (position < end)) {
-        isValidDelimiter = false;
-        return false;
-    }
-    skipWhile<CharType, isWhitespace>(position, end);
-    if (position == end)
-        return false;
-    return true;
-}
-
-static LinkHeader::LinkParameterName paramterNameFromString(String name)
-{
-    // FIXME: Add support for more header parameters as neccessary.
-    if (name == "rel")
-        return LinkHeader::LinkParameterRel;
-    return LinkHeader::LinkParameterUnknown;
-}
-
-// Before:
-//
-// <cat.jpg>; rel=preload
-//            ^          ^
-//            position   end
-//
-// After (if successful: otherwise the method returns false)
-//
-// <cat.jpg>; rel=preload
-//                ^      ^
-//            position  end
-template <typename CharType>
-static bool parseParameterName(CharType*& position, CharType* end, LinkHeader::LinkParameterName& name)
-{
-    CharType* nameStart = position;
-    skipWhile<CharType, isValidParameterNameChar>(position, end);
-    CharType* nameEnd = position;
-    skipWhile<CharType, isWhitespace>(position, end);
-    if (!skipExactly<CharType>(position, end, '='))
-        return false;
-    skipWhile<CharType, isWhitespace>(position, end);
-    name = paramterNameFromString(String(nameStart, nameEnd - nameStart));
-    return true;
-}
-
-// Before:
-//
-// <cat.jpg>; rel=preload; foo=bar
-//                ^               ^
-//            position            end
-//
-// After (if successful: otherwise the method returns false)
-//
-// <cat.jpg>; rel=preload; foo=bar
-//                       ^        ^
-//                   position     end
-template <typename CharType>
-static bool parseParameterValue(CharType*& position, CharType* end, String& value)
-{
-    CharType* valueStart = position;
-    skipWhile<CharType, isValidParameterValueChar>(position, end);
-    CharType* valueEnd = position;
-    skipWhile<CharType, isWhitespace>(position, end);
-    if ((valueEnd == valueStart) || (*position != ';' && position != end))
-        return false;
-    value = String(valueStart, valueEnd - valueStart);
-    return true;
-}
-
-void LinkHeader::setValue(LinkParameterName name, String value)
-{
-    // FIXME: Add support for more header parameters as neccessary.
-    if (name == LinkParameterRel)
-        m_rel = value;
-}
-
-template <typename CharType>
-bool LinkHeader::init(CharType* headerValue, unsigned len)
-{
-    CharType* position = headerValue;
-    CharType* end = headerValue + len;
-
-    if (!parseURL(position, end, m_url))
-        return false;
-
-    while (position < end) {
-        bool isValidDelimiter;
-        if (!parseParameterDelimiter(position, end, isValidDelimiter))
-            return isValidDelimiter;
-
-        LinkParameterName parameterName;
-        if (!parseParameterName(position, end, parameterName))
-            return false;
-
-        String parameterValue;
-        if (!parseParameterValue(position, end, parameterValue))
-            return false;
-
-        setValue(parameterName, parameterValue);
-    }
-
-    return true;
-}
-
-LinkHeader::LinkHeader(const String& header)
-{
-    if (header.isNull()) {
-        m_isValid = false;
-        return;
-    }
-
-    if (header.is8Bit())
-        m_isValid = init(header.characters8(), header.length());
-    else
-        m_isValid = init(header.characters16(), header.length());
-}
-
-}