Fix nit and range check, from late mseaborn comment on previous commit.
Fix nit and range check, from late mseaborn comment on previous commit.

See: https://codereview.chromium.org/11420085/

R=kschimpf@google.com, mseaborn@chromium.org

Review URL: https://codereview.chromium.org/11299123

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@10320 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client