Sort headers for iteration

third_party/WebKit/Source/modules/fetch/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 "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 #include <memory>
 #include <utility>
 
 namespace blink {
 
 class Header;
 
 // http://fetch.spec.whatwg.org/#terminology-headers
 class MODULES_EXPORT FetchHeaderList final
     : public GarbageCollectedFinalized<FetchHeaderList> {
  public:
   typedef std::pair<String, String> Header;
   static FetchHeaderList* create();
-  FetchHeaderList* clone();
+  FetchHeaderList* clone() const;
 
   ~FetchHeaderList();
   void append(const String&, const String&);
   void set(const String&, const String&);
   // FIXME: Implement parse()
   String extractMIMEType() const;
 
   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;
+  void sortAndCombine();
 
   const Vector<std::unique_ptr<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&);
 
   DEFINE_INLINE_TRACE() {}
 
  private:
   FetchHeaderList();
   Vector<std::unique_ptr<Header>> m_headerList;
 };
 
 }  // namespace blink
 
 #endif  // FetchHeaderList_h