Introduce enum class TextAffinity as replacement of enum EAffinity

Source/core/editing/commands/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 1269 matching lines @@
     // instead of nbsps for some spaces that were rendered (11475), which causes
     // spaces to be collapsed during the move operation. This results in a call
     // to rangeFromLocationAndLength with a location past the end of the
     // document (which will return null).
     EphemeralRange startRange = PlainTextRange(destinationIndex + startIndex).createRangeForSelection(*documentElement);
     if (startRange.isNull())
         return;
     EphemeralRange endRange = PlainTextRange(destinationIndex + endIndex).createRangeForSelection(*documentElement);
     if (endRange.isNull())
         return;
-    setEndingSelection(VisibleSelection(startRange.startPosition(), endRange.startPosition(), DOWNSTREAM, originalIsDirectional));
+    setEndingSelection(VisibleSelection(startRange.startPosition(), endRange.startPosition(), TextAffinity::Downstream, originalIsDirectional));
 }
 
 // FIXME: Send an appropriate shouldDeleteRange call.
 bool CompositeEditCommand::breakOutOfEmptyListItem()
 {
     RefPtrWillBeRawPtr<Node> emptyListItem = enclosingEmptyListItem(endingSelection().visibleStart());
     if (!emptyListItem)
         return false;
 
     RefPtrWillBeRawPtr<EditingStyle> style = EditingStyle::create(endingSelection().start());
@@ skipping 40 matching lines @@
         insertNodeBefore(newBlock, listNode);
         removeNode(emptyListItem);
     } else {
         // When emptyListItem does not follow any list item or nested list, insert newBlock after the enclosing list node.
         // Remove the enclosing node if emptyListItem is the only child; otherwise just remove emptyListItem.
         insertNodeAfter(newBlock, listNode);
         removeNode(isListItem(previousListNode.get()) || isHTMLListElement(previousListNode.get()) ? emptyListItem.get() : listNode.get());
     }
 
     appendBlockPlaceholder(newBlock);
-    setEndingSelection(VisibleSelection(firstPositionInNode(newBlock.get()), DOWNSTREAM, endingSelection().isDirectional()));
+    setEndingSelection(VisibleSelection(firstPositionInNode(newBlock.get()), TextAffinity::Downstream, endingSelection().isDirectional()));
 
     style->prepareToApplyAt(endingSelection().start());
     if (!style->isEmpty())
         applyStyle(style.get());
 
     return true;
 }
 
 // If the caret is in an empty quoted paragraph, and either there is nothing before that
 // paragraph, or what is before is unquoted, and the user presses delete, unquote that paragraph.
@@ skipping 140 matching lines @@
 }
 
 DEFINE_TRACE(CompositeEditCommand)
 {
     visitor->trace(m_commands);
     visitor->trace(m_composition);
     EditCommand::trace(visitor);
 }
 
 } // namespace blink