Use PositionMoveType::GraphemeBoundary

third_party/WebKit/Source/core/editing/EditingUtilities.h

 /*
  * Copyright (C) 2004, 2006, 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 27 matching lines @@
 #include "wtf/text/CharacterNames.h"
 
 namespace blink {
 
 enum class PositionMoveType {
     // Move by a single code unit. |PositionMoveType::CodeUnit| is used for
     // implementing other |PositionMoveType|. You should not use this.
     CodeUnit,
     // Move to the next Unicode code point. At most two code unit when we are
     // at surrogate pair. Please consider using |GraphemeCluster|.
-    CodePoint,
-    // Used with |previousPositionOf()| to compute number of code units as
-    // backward deletion, e.g Backspace key. This is similar to
-    // |GraphemeCluster| but some tailoring with platform dependent behavior.
     BackwardDeletion,
-    // TODO(yosin): We'll have |GraphemeCluster| move type.
     // Move by a grapheme cluster for user-perceived character in Unicode
     // Standard Annex #29, Unicode text segmentation[1].
     // [1] http://www.unicode.org/reports/tr29/
-    // GraphemeCluster,
+    GraphemeCluster,
 };
 
 class Document;
 class Element;
 class HTMLBRElement;
 class HTMLElement;
 class HTMLLIElement;
 class HTMLSpanElement;
 class HTMLUListElement;
 class Node;
@@ skipping 277 matching lines @@
     // FIXME: this is required until 6853027 is fixed and text checking can do this for us.
     return character == '\'' || character == rightSingleQuotationMarkCharacter || character == hebrewPunctuationGershayimCharacter;
 }
 
 String stringWithRebalancedWhitespace(const String&, bool startIsStartOfParagraph, bool endIsEndOfParagraph);
 const String& nonBreakingSpaceString();
 
 } // namespace blink
 
 #endif