Rewrite DocumentMarkerController to use SynchronousMutationObserver

third_party/WebKit/Source/core/editing/commands/InsertParagraphSeparatorCommand.cpp

 /*
  * Copyright (C) 2005, 2006 Apple Computer, 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 446 matching lines @@
       leadingWhitespacePosition(insertionPosition, VP_DEFAULT_AFFINITY);
   // FIXME: leadingWhitespacePosition is returning the position before preserved
   // newlines for positions after the preserved newline, causing the newline to
   // be turned into a nbsp.
   if (leadingWhitespace.isNotNull() &&
       leadingWhitespace.anchorNode()->isTextNode()) {
     Text* textNode = toText(leadingWhitespace.anchorNode());
     DCHECK(!textNode->layoutObject() ||
            textNode->layoutObject()->style()->collapseWhiteSpace())
         << textNode;
-    replaceTextInNodePreservingMarkers(
-        textNode, leadingWhitespace.computeOffsetInContainerNode(), 1,
-        nonBreakingSpaceString());
+    replaceTextInNode(textNode,
+                      leadingWhitespace.computeOffsetInContainerNode(), 1,
+                      nonBreakingSpaceString());
     document().updateStyleAndLayoutIgnorePendingStylesheets();
   }
 
   // Split at pos if in the middle of a text node.
   Position positionAfterSplit;
   if (insertionPosition.isOffsetInAnchor() &&
       insertionPosition.computeContainerNode()->isTextNode()) {
     Text* textNode = toText(insertionPosition.computeContainerNode());
     int textOffset = insertionPosition.offsetInContainerNode();
     bool atEnd = static_cast<unsigned>(textOffset) >= textNode->length();
@@ skipping 97 matching lines @@
                          .build());
   applyStyleAfterInsertion(startBlock, editingState);
 }
 
 DEFINE_TRACE(InsertParagraphSeparatorCommand) {
   visitor->trace(m_style);
   CompositeEditCommand::trace(visitor);
 }
 
 }  // namespace blink