[ServiceWorker] Make fetch() method better conformance with the spec.

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"
@@ skipping 19 matching lines @@
     // 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; }
 
     static bool isValidHeaderName(const String&);
     static bool isValidHeaderValue(const String&);
     static bool isSimpleHeader(const String&, const String&);
     static bool isForbiddenHeaderName(const String&);
     static bool isForbiddenResponseHeaderName(const String&);
 
     void trace(Visitor*) { }
 
 private:
     FetchHeaderList();
     Vector<OwnPtr<Header> > m_headerList;
 };
 
 } // namespace blink
 
 #endif // FetchHeaderList_h