fix build errors

Author: safareli

src/DOM/File/Blob.js

@@ -4,12 +4,12 @@ exports.typeImpl = function (blob) { return blob.type; };
 
 exports.size = function (blob) { return blob.size; };
 
-exports._slice = function (contentType) {
+exports.slice = function (contentType) {
   return function (start) {
     return function (end) {
       return function (blob) {
         return blob.slice(start, end, contentType);
-      }
-    }
-  }
-}
+      };
+    };
+  };
+};

src/DOM/File/Blob.purs

@@ -14,7 +14,6 @@ import DOM.File.Types (Blob)
 import Data.Int (toNumber)
 import Data.Maybe (Maybe(..))
 import Data.MediaType (MediaType(..))
-import Data.Newtype (unwrap)
 import Math (round)
 import Prelude ((==), (>>>))
 import Unsafe.Coerce (unsafeCoerce)