Fix missing () on function call causing warning on some versions

src/bootstrapper.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 82 matching lines @@
 
 static SourceCodeCache natives_cache(Script::TYPE_NATIVE);
 static SourceCodeCache extensions_cache(Script::TYPE_EXTENSION);
 // This is for delete, not delete[].
 static List<char*>* delete_these_non_arrays_on_tear_down = NULL;
 
 
 Handle<String> Bootstrapper::NativesSourceLookup(int index) {
   ASSERT(0 <= index && index < Natives::GetBuiltinsCount());
   if (Heap::natives_source_cache()->get(index)->IsUndefined()) {
-    if (!Snapshot::IsEnabled || FLAG_new_snapshot) {
+    if (!Snapshot::IsEnabled() || FLAG_new_snapshot) {
       if (delete_these_non_arrays_on_tear_down == NULL) {
         delete_these_non_arrays_on_tear_down = new List<char*>(2);
       }
       // We can use external strings for the natives.
       NativesExternalStringResource* resource =
           new NativesExternalStringResource(
               Natives::GetScriptSource(index).start());
       // The resources are small objects and we only make a fixed number of
       // them, but lets clean them up on exit for neatness.
       delete_these_non_arrays_on_tear_down->
@@ skipping 1519 matching lines @@
 }
 
 
 // Restore statics that are thread local.
 char* Genesis::RestoreState(char* from) {
   current_ = *reinterpret_cast<Genesis**>(from);
   return from + sizeof(current_);
 }
 
 } }  // namespace v8::internal