Introduce enum class TextAffinity as replacement of enum EAffinity

Source/core/editing/spellcheck/SpellChecker.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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 604 matching lines @@
             frame().document()->markers().addMarker(invisibleSpellcheckRange.startPosition(), invisibleSpellcheckRange.endPosition(), DocumentMarker::InvisibleSpellcheck, result->replacement, result->hash);
         }
     }
 
     if (selectionChanged) {
         TextCheckingParagraph extendedParagraph(paragraph);
         // Restore the caret position if we have made any replacements
         extendedParagraph.expandRangeToNextEnd();
         if (restoreSelectionAfterChange && selectionOffset >= 0 && selectionOffset <= extendedParagraph.rangeLength()) {
             RefPtrWillBeRawPtr<Range> selectionRange = extendedParagraph.subrange(0, selectionOffset);
-            frame().selection().moveTo(selectionRange->endPosition(), DOWNSTREAM);
+            frame().selection().moveTo(selectionRange->endPosition(), TextAffinity::Downstream);
             if (adjustSelectionForParagraphBoundaries)
                 frame().selection().modify(FrameSelection::AlterationMove, DirectionForward, CharacterGranularity);
         } else {
             // If this fails for any reason, the fallback is to go one position beyond the last replacement
             frame().selection().moveTo(frame().selection().selection().visibleEnd());
             frame().selection().modify(FrameSelection::AlterationMove, DirectionForward, CharacterGranularity);
         }
     }
 }
 
@@ skipping 301 matching lines @@
     m_spellCheckRequester->requestCheckingFor(SpellCheckRequest::create(TextCheckingTypeSpelling | TextCheckingTypeGrammar, TextCheckingProcessBatch, rangeToCheck, rangeToCheck));
 }
 
 DEFINE_TRACE(SpellChecker)
 {
     visitor->trace(m_frame);
     visitor->trace(m_spellCheckRequester);
 }
 
 } // namespace blink