ALL-IN-ONE Introduce enum class TextAffinity

Source/core/editing/TextAffinity.h

 /*
  * Copyright (C) 2004 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 18 matching lines @@
 #ifdef __OBJC__
 #include <AppKit/NSTextView.h>
 #endif
 
 namespace blink {
 
 // These match the AppKit values for these concepts.
 // From NSTextView.h:
 // NSSelectionAffinityUpstream = 0
 // NSSelectionAffinityDownstream = 1
-// TODO(yosin) We should rename |UPSTREAM| and |DOWNSTREAM| to use
-// capitalized name.
-enum EAffinity { UPSTREAM = 0, DOWNSTREAM = 1 }; // NOLINT
+enum class TextAffinity { Upstream = 0, Downstream = 1 };
 
 } // namespace blink
 
 #ifdef __OBJC__
 
-inline NSSelectionAffinity kit(blink::EAffinity affinity)
+inline NSSelectionAffinity kit(blink::TextAffinity affinity)
 {
     return static_cast<NSSelectionAffinity>(affinity);
 }
 
-inline blink::EAffinity core(NSSelectionAffinity affinity)
+inline blink::TextAffinity core(NSSelectionAffinity affinity)
 {
-    return static_cast<blink::EAffinity>(affinity);
+    return static_cast<blink::TextAffinity>(affinity);
 }
 
 #endif
 
 #endif // TextAffinity_h