Make ELineBreak an enum class.

third_party/WebKit/Source/core/layout/line/InlineTextBox.cpp

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc.
  *               All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 165 matching lines @@
   if (state == SelectionStart || state == SelectionEnd ||
       state == SelectionBoth) {
     int start_pos, end_pos;
     std::tie(start_pos, end_pos) = GetLineLayoutItem().SelectionStartEnd();
     // The position after a hard line break is considered to be past its end.
     // See the corresponding code in InlineTextBox::isSelected.
     int last_selectable = Start() + Len() - (IsLineBreak() ? 1 : 0);
 
     // FIXME: Remove -webkit-line-break: LineBreakAfterWhiteSpace.
     int end_of_line_adjustment_for_css_line_break =
-        GetLineLayoutItem().Style()->GetLineBreak() == kLineBreakAfterWhiteSpace
+        GetLineLayoutItem().Style()->GetLineBreak() ==
+                LineBreak::kAfterWhiteSpace
             ? -1
             : 0;
     bool start = (state != SelectionEnd && start_pos >= start_ &&
                   start_pos <= start_ + len_ +
                                    end_of_line_adjustment_for_css_line_break);
     bool end = (state != SelectionStart && end_pos > start_ &&
                 end_pos <= last_selectable);
     if (start && end)
       state = SelectionBoth;
     else if (start)
@@ skipping 563 matching lines @@
   for (; printed_characters < kLayoutObjectCharacterOffset;
        printed_characters++)
     fputc(' ', stderr);
   fprintf(stderr, "(%d,%d) \"%s\"\n", Start(), Start() + Len(),
           value.Utf8().data());
 }
 
 #endif
 
 }  // namespace blink