Have Document::markers() return a reference

Source/core/editing/CompositeEditCommand.cpp

 /*
  * Copyright (C) 2005, 2006, 2007, 2008 Apple 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:
  * 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 479 matching lines @@
 {
     size_t arraySize = markerPointers.size();
     markers.reserveCapacity(arraySize);
     for (size_t i = 0; i < arraySize; ++i)
         markers.append(*markerPointers[i]);
 }
 
 void CompositeEditCommand::replaceTextInNodePreservingMarkers(PassRefPtr<Text> prpNode, unsigned offset, unsigned count, const String& replacementText)
 {
     RefPtr<Text> node(prpNode);
-    DocumentMarkerController* markerController = document().markers();
+    DocumentMarkerController& markerController = document().markers();
     Vector<DocumentMarker> markers;
-    copyMarkers(markerController->markersInRange(Range::create(document(), node.get(), offset, node.get(), offset + count).get(), DocumentMarker::AllMarkers()), markers);
+    copyMarkers(markerController.markersInRange(Range::create(document(), node.get(), offset, node.get(), offset + count).get(), DocumentMarker::AllMarkers()), markers);
     replaceTextInNode(node, offset, count, replacementText);
     RefPtr<Range> newRange = Range::create(document(), node.get(), offset, node.get(), offset + replacementText.length());
     for (size_t i = 0; i < markers.size(); ++i)
-        markerController->addMarker(newRange.get(), markers[i].type(), markers[i].description());
+        markerController.addMarker(newRange.get(), markers[i].type(), markers[i].description());
 }
 
 Position CompositeEditCommand::positionOutsideTabSpan(const Position& pos)
 {
     if (!isTabSpanTextNode(pos.anchorNode()))
         return pos;
 
     switch (pos.anchorType()) {
     case Position::PositionIsBeforeChildren:
     case Position::PositionIsAfterChildren:
@@ skipping 939 matching lines @@
     return node.release();
 }
 
 PassRefPtr<Element> createBlockPlaceholderElement(Document& document)
 {
     RefPtr<Element> breakNode = document.createElement(brTag, false);
     return breakNode.release();
 }
 
 } // namespace WebCore