Sort headers for iteration

third_party/WebKit/Source/modules/fetch/FetchHeaderList.h

Index: third_party/WebKit/Source/modules/fetch/FetchHeaderList.h
diff --git a/third_party/WebKit/Source/modules/fetch/FetchHeaderList.h b/third_party/WebKit/Source/modules/fetch/FetchHeaderList.h
index f56c19f689f0f2f03d537ff3d42810dde173499b..bfe552f483edeb89a46e88b229c023bc1febd9a4 100644
--- a/third_party/WebKit/Source/modules/fetch/FetchHeaderList.h
+++ b/third_party/WebKit/Source/modules/fetch/FetchHeaderList.h
@@ -23,7 +23,7 @@ class MODULES_EXPORT FetchHeaderList final
  public:
   typedef std::pair<String, String> Header;
   static FetchHeaderList* create();
-  FetchHeaderList* clone();
+  FetchHeaderList* clone() const;
 
   ~FetchHeaderList();
   void append(const String&, const String&);
@@ -39,6 +39,7 @@ class MODULES_EXPORT FetchHeaderList final
   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 {