Make ESpeak 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..a467d52a8978fd25251f6c63795434da961fe5f1 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyle.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyle.h
@@ -1762,11 +1762,13 @@ class CORE_EXPORT ComputedStyle : public ComputedStyleBase,
   }
 
   // speak
-  static ESpeak InitialSpeak() { return kSpeakNormal; }
+  static ESpeak InitialSpeak() { return ESpeak::kNormal; }
   ESpeak Speak() const {
     return static_cast<ESpeak>(rare_inherited_data_->speak_);
   }
-  void SetSpeak(ESpeak s) { SET_VAR(rare_inherited_data_, speak_, s); }
+  void SetSpeak(ESpeak s) {
+    SET_VAR(rare_inherited_data_, speak_, static_cast<unsigned>(s));
+  }
 
   // tab-size
   static TabSize InitialTabSize() { return TabSize(8); }