Move Fetch API releted code to modules/fetch.

Source/modules/serviceworkers/FetchHeaderList.h

-// Copyright 2014 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.
-
-#ifndef FetchHeaderList_h
-#define FetchHeaderList_h
-
-#include "platform/heap/Handle.h"
-#include "wtf/OwnPtr.h"
-#include "wtf/PassRefPtr.h"
-#include "wtf/Vector.h"
-#include "wtf/text/WTFString.h"
-#include <utility>
-
-namespace blink {
-
-class Header;
-
-// http://fetch.spec.whatwg.org/#terminology-headers
-class FetchHeaderList final : public GarbageCollectedFinalized<FetchHeaderList> {
-public:
-    typedef std::pair<String, String> Header;
-    static FetchHeaderList* create();
-    FetchHeaderList* createCopy();
-
-    ~FetchHeaderList();
-    void append(const String&, const String&);
-    void set(const String&, const String&);
-    // FIXME: Implement parse()
-    // FIXME: Implement extractMIMEType()
-
-    size_t size() const;
-    void remove(const String&);
-    bool get(const String&, String&) const;
-    void getAll(const String&, Vector<String>&) const;
-    bool has(const String&) const;
-    void clearList();
-
-    bool containsNonSimpleHeader() const;
-
-    const Vector<OwnPtr<Header> >& list() const { return m_headerList; }
-    const Header& entry(size_t index) const { return *(m_headerList[index].get()); }
-
-    static bool isValidHeaderName(const String&);
-    static bool isValidHeaderValue(const String&);
-
-    void trace(Visitor*) { }
-
-private:
-    FetchHeaderList();
-    Vector<OwnPtr<Header> > m_headerList;
-};
-
-} // namespace blink
-
-#endif // FetchHeaderList_h