[DMC #5] Add SpellCheckMarkerListImpl

third_party/WebKit/Source/core/editing/markers/DocumentMarkerListEditor.h

 // Copyright 2017 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 DocumentMarkerListEditor_h
 #define DocumentMarkerListEditor_h
 
 #include "core/editing/markers/DocumentMarkerList.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class DocumentMarker;
 class RenderedDocumentMarker;
 
 class DocumentMarkerListEditor {
  public:
   using MarkerList = HeapVector<Member<RenderedDocumentMarker>>;
 
-  static void AddMarkerAndMergeOverlapping(MarkerList*, const DocumentMarker*);
   static void AddMarkerWithoutMergingOverlapping(MarkerList*,
                                                  const DocumentMarker*);
 
   // Returns true if a marker was moved, false otherwise.
   static bool MoveMarkers(MarkerList* src_list,
                           int length,
                           DocumentMarkerList* dst_list);
 
   // Returns true if a marker was removed, false otherwise.
   static bool RemoveMarkers(MarkerList*, unsigned start_offset, int length);
 
   // Returns true if a marker was removed, false otherwise.
   static bool RemoveMarkersUnderWords(MarkerList*,
                                       const String& node_text,
                                       const Vector<String>& words);
 
   // Returns true if a marker was shifted or removed, false otherwise.
   static bool ShiftMarkers(MarkerList*,
                            unsigned offset,
                            unsigned old_length,
                            unsigned new_length);
 };
 
 }  // namespace blink
 
 #endif  // DocumentMarkerListEditor_h