Make ETextModify an enum class.

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

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2010 Google 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
@@ skipping 297 matching lines @@
               PreviousPositionOf(end, PositionMoveType::kCodeUnit)) &&
           IsNewLineAtPosition(end))
         end = Position(end.ComputeContainerNode(), end_offset + 1);
       if (is_end_and_end_of_last_paragraph_on_same_node &&
           end.OffsetInContainerNode() >=
               end_of_last_paragraph.OffsetInContainerNode())
         end_of_last_paragraph = end;
     }
 
     // If end is in the middle of a text node, split.
-    if (end_style->UserModify() != READ_ONLY &&
+    if (end_style->UserModify() != EUserModify::kReadOnly &&
         !end_style->CollapseWhiteSpace() && end.OffsetInContainerNode() &&
         end.OffsetInContainerNode() <
             end.ComputeContainerNode()->MaxCharacterOffset()) {
       Text* end_container = ToText(end.ComputeContainerNode());
       SplitTextNode(end_container, end.OffsetInContainerNode());
       GetDocument().UpdateStyleAndLayoutTree();
 
       if (is_start_and_end_on_same_node)
         start = FirstPositionInOrBeforeNode(end_container->previousSibling());
       if (is_end_and_end_of_last_paragraph_on_same_node) {
@@ skipping 82 matching lines @@
 }
 
 HTMLElement* ApplyBlockElementCommand::CreateBlockElement() const {
   HTMLElement* element = CreateHTMLElement(GetDocument(), tag_name_);
   if (inline_style_.length())
     element->setAttribute(styleAttr, inline_style_);
   return element;
 }
 
 }  // namespace blink