Have Document::markers() return a reference

Source/core/editing/Editor.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 1198 matching lines @@
 
     return resultRange->collapsed(ASSERT_NO_EXCEPTION) ? nullptr : resultRange.release();
 }
 
 void Editor::setMarkedTextMatchesAreHighlighted(bool flag)
 {
     if (flag == m_areMarkedTextMatchesHighlighted)
         return;
 
     m_areMarkedTextMatchesHighlighted = flag;
-    m_frame.document()->markers()->repaintMarkers(DocumentMarker::TextMatch);
+    m_frame.document()->markers().repaintMarkers(DocumentMarker::TextMatch);
 }
 
 void Editor::respondToChangedSelection(const VisibleSelection& oldSelection, FrameSelection::SetSelectionOptions options)
 {
     spellChecker().respondToChangedSelection(oldSelection, options);
     m_frame.inputMethodController().cancelCompositionIfSelectionIsInvalid();
     notifyComponentsOnChangedSelection(oldSelection, options);
 }
 
 SpellChecker& Editor::spellChecker() const
 {
     return m_frame.spellChecker();
 }
 
 void Editor::toggleOverwriteModeEnabled()
 {
     m_overwriteModeEnabled = !m_overwriteModeEnabled;
     frame().selection().setShouldShowBlockCursor(m_overwriteModeEnabled);
 }
 
 } // namespace WebCore