[DMC #17.5] Eliminate DocumentMarker and TextMatchMarker copy constructors

third_party/WebKit/Source/core/editing/markers/DocumentMarkerListEditor.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/DocumentMarkerListEditor.h"
 
 #include "core/editing/markers/SpellCheckMarkerListImpl.h"
 
 namespace blink {
 
@@ skipping 48 matching lines @@
                                              unsigned start_offset,
                                              int length) {
   bool doc_dirty = false;
   const unsigned end_offset = start_offset + length;
   MarkerList::iterator start_pos = std::upper_bound(
       list->begin(), list->end(), start_offset,
       [](size_t start_offset, const Member<DocumentMarker>& marker) {
         return start_offset < marker->EndOffset();
       });
   for (MarkerList::iterator i = start_pos; i != list->end();) {
-    DocumentMarker marker(*i->Get());
+    const DocumentMarker& marker = *i->Get();
 
     // markers are returned in order, so stop if we are now past the specified
     // range
     if (marker.StartOffset() >= end_offset)
       break;
 
     list->erase(i - list->begin());
     doc_dirty = true;
   }
 
@@ skipping 55 matching lines @@
       did_shift_marker = true;
       marker.SetStartOffset(result.value().start_offset);
       marker.SetEndOffset(result.value().end_offset);
     }
   }
 
   return did_shift_marker;
 }
 
 }  // namespace blink