Make EIsolation an enum class.

third_party/WebKit/Source/core/style/ComputedStyleConstants.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  *
@@ skipping 270 matching lines @@
   kAutoFlowColumnDense =
       kInternalAutoFlowAlgorithmDense | kInternalAutoFlowDirectionColumn
 };
 
 enum DraggableRegionMode {
   kDraggableRegionNone,
   kDraggableRegionDrag,
   kDraggableRegionNoDrag
 };
 
-enum EIsolation { kIsolationAuto, kIsolationIsolate };
+enum class EIsolation { kAuto, kIsolate };
 
 static const size_t kContainmentBits = 4;
 enum Containment {
   kContainsNone = 0x0,
   kContainsLayout = 0x1,
   kContainsStyle = 0x2,
   kContainsPaint = 0x4,
   kContainsSize = 0x8,
   kContainsStrict =
       kContainsLayout | kContainsStyle | kContainsPaint | kContainsSize,
@@ skipping 78 matching lines @@
 enum class PageSizeType {
   kAuto,       // size: auto
   kLandscape,  // size: landscape
   kPortrait,   // size: portrait
   kResolved    // Size is fully resolved.
 };
 
 }  // namespace blink
 
 #endif  // ComputedStyleConstants_h