Make ELineBreak an enum class.

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

Index: third_party/WebKit/Source/core/style/ComputedStyle.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyle.h b/third_party/WebKit/Source/core/style/ComputedStyle.h
index 74f2435d204fad85f976a3cbe27f5e45a72ba15d..03a0c7979bf42bcd819eea9b8c9a51af9e06aaf0 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.h
@@ -1861,12 +1861,12 @@ class CORE_EXPORT ComputedStyle : public ComputedStyleBase,
   }
 
   // -webkit-line-break
-  static LineBreak InitialLineBreak() { return kLineBreakAuto; }
+  static LineBreak InitialLineBreak() { return LineBreak::kAuto; }
   LineBreak GetLineBreak() const {
     return static_cast<LineBreak>(rare_inherited_data_->line_break_);
   }
   void SetLineBreak(LineBreak b) {
-    SET_VAR(rare_inherited_data_, line_break_, b);
+    SET_VAR(rare_inherited_data_, line_break_, static_cast<unsigned>(b));
   }
 
   // Text emphasis properties.
@@ -3397,7 +3397,7 @@ class CORE_EXPORT ComputedStyle : public ComputedStyleBase,
   }
   bool BreakOnlyAfterWhiteSpace() const {
     return WhiteSpace() == EWhiteSpace::kPreWrap ||
-           GetLineBreak() == kLineBreakAfterWhiteSpace;
+           GetLineBreak() == LineBreak::kAfterWhiteSpace;
   }
 
   bool BreakWords() const {