Change in preparation of fixing issue 19500.

tools/dom/templates/html/impl/impl_FileReader.darttemplate

Index: tools/dom/templates/html/impl/impl_FileReader.darttemplate
===================================================================
--- tools/dom/templates/html/impl/impl_FileReader.darttemplate	(revision 38259)
+++ tools/dom/templates/html/impl/impl_FileReader.darttemplate	(working copy)
@@ -7,17 +7,19 @@
 @DocsEditable()
 $(ANNOTATIONS)$(CLASS_MODIFIERS)class $CLASSNAME$EXTENDS$IMPLEMENTS$NATIVESPEC {
 
-$if DART2JS
   @DomName('FileReader.result')
   @DocsEditable()
   Object get result {
+$if DART2JS
     var res = JS('Null|String|NativeByteBuffer', '#.result', this);
+$else
+    var res = _blink.BlinkFileReader.$result_Getter(this);
+$endif
     if (res is ByteBuffer) {
       return new Uint8List.view(res);
     }
     return res;
   }
-$endif
 
 $!MEMBERS
 }