Make base::Value::TYPE a scoped enum.

content/public/child/v8_value_converter.h

Index: content/public/child/v8_value_converter.h
diff --git a/content/public/child/v8_value_converter.h b/content/public/child/v8_value_converter.h
index aeb38c9a82933cd4f05f0f7911c22a3171af510b..9afeb397bc56b2d5acbe337f5d16538d31bb0827 100644
--- a/content/public/child/v8_value_converter.h
+++ b/content/public/child/v8_value_converter.h
@@ -117,11 +117,11 @@ class CONTENT_EXPORT V8ValueConverter {
   //
   // Unsupported types (unless explicitly configured) are not converted, so
   // this method may return NULL -- the exception is when converting arrays,
-  // where unsupported types are converted to Value(TYPE_NULL).
+  // where unsupported types are converted to Value(Type::NONE).
   //
   // Likewise, if an object throws while converting a property it will not be
   // converted, whereas if an array throws while converting an item it will be
-  // converted to Value(TYPE_NULL).
+  // converted to Value(Type::NONE).
   virtual std::unique_ptr<base::Value> FromV8Value(
       v8::Local<v8::Value> value,
       v8::Local<v8::Context> context) const = 0;