Make EIsolation an enum class.

third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h

 /*
  * Copyright (C) 2007 Alexey Proskuryakov <ap@nypop.com>.
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2009 Jeff Schiller <codedread@gmail.com>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ skipping 2341 matching lines @@
   }
 
   NOTREACHED();
   return TouchAction::kTouchActionNone;
 }
 
 template <>
 inline CSSIdentifierValue::CSSIdentifierValue(EIsolation i)
     : CSSValue(kIdentifierClass) {
   switch (i) {
-    case kIsolationAuto:
+    case EIsolation::kAuto:
       value_id_ = CSSValueAuto;
       break;
-    case kIsolationIsolate:
+    case EIsolation::kIsolate:
       value_id_ = CSSValueIsolate;
       break;
   }
 }
 
 template <>
 inline EIsolation CSSIdentifierValue::ConvertTo() const {
   switch (value_id_) {
     case CSSValueAuto:
-      return kIsolationAuto;
+      return EIsolation::kAuto;
     case CSSValueIsolate:
-      return kIsolationIsolate;
+      return EIsolation::kIsolate;
     default:
       break;
   }
 
   NOTREACHED();
-  return kIsolationAuto;
+  return EIsolation::kAuto;
 }
 
 template <>
 inline CSSIdentifierValue::CSSIdentifierValue(CSSBoxType css_box)
     : CSSValue(kIdentifierClass) {
   switch (css_box) {
     case kMarginBox:
       value_id_ = CSSValueMarginBox;
       break;
     case kBorderBox:
@@ skipping 370 matching lines @@
     default:
       break;
   }
   NOTREACHED();
   return kContainsNone;
 }
 
 }  // namespace blink
 
 #endif