[DMC #20] Remove DocumentMarker::IsActiveMatch() and SetIsActiveMatch() methods

third_party/WebKit/Source/core/editing/markers/TextMatchMarkerListImpl.cpp

 // 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.
 
 #include "core/editing/markers/TextMatchMarkerListImpl.h"
 
 #include "core/dom/Node.h"
 #include "core/dom/Range.h"
 #include "core/editing/EphemeralRange.h"
 #include "core/editing/markers/DocumentMarkerListEditor.h"
@@ skipping 77 matching lines @@
       markers_.begin(), markers_.end(), start_offset,
       [](size_t start_offset, const Member<DocumentMarker>& marker) {
         return start_offset < marker->EndOffset();
       });
   for (auto it = start; it != markers_.end(); ++it) {
     DocumentMarker& marker = **it;
     // Markers are returned in order, so stop if we are now past the specified
     // range.
     if (marker.StartOffset() >= end_offset)
       break;
-    marker.SetIsActiveMatch(active);
+    ToTextMatchMarker(marker).SetIsActiveMatch(active);
     doc_dirty = true;
   }
   return doc_dirty;
 }
 
 }  // namespace blink