Fix block-for test

The test didn't call the test function.

BUG=v8:3932
LOG=N
TBR=ulan@chromium.org

Review URL: https://codereview.chromium.org/964993002

Cr-Commit-Position: refs/heads/master@{#26927}

test/mjsunit/harmony/block-for.js

@@ -147,7 +147,7 @@ function closure_in_for_cond() {
     assertEquals(k, a[k]());
   }
 }
-closure_in_for_next();
+closure_in_for_cond();
 
 
 function closure_in_for_next() {