[DMC #25] Make DocumentMarker::GetType() virtual

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

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 18 matching lines @@
  */
 
 #include "core/editing/markers/DocumentMarker.h"
 
 #include "platform/wtf/StdLibExtras.h"
 
 namespace blink {
 
 DocumentMarker::~DocumentMarker() {}
 
-DocumentMarker::DocumentMarker(MarkerType type,
-                               unsigned start_offset,
-                               unsigned end_offset)
-    : type_(type), start_offset_(start_offset), end_offset_(end_offset) {}
+DocumentMarker::DocumentMarker(unsigned start_offset, unsigned end_offset)
+    : start_offset_(start_offset), end_offset_(end_offset) {}
 
 Optional<DocumentMarker::MarkerOffsets>
 DocumentMarker::ComputeOffsetsAfterShift(unsigned offset,
                                          unsigned old_length,
                                          unsigned new_length) const {
   MarkerOffsets result;
   result.start_offset = StartOffset();
   result.end_offset = EndOffset();
 
   // algorithm inspired by https://dom.spec.whatwg.org/#concept-cd-replace
@@ skipping 33 matching lines @@
 
   return result;
 }
 
 void DocumentMarker::ShiftOffsets(int delta) {
   start_offset_ += delta;
   end_offset_ += delta;
 }
 
 }  // namespace blink