Remove stray #include of <nacl/nacl_av.h>
Remove stray #include of <nacl/nacl_av.h>

r5102 removed <nacl/nacl_av.h> and all the code that needed it,
but missed removing one #include.

BUG=none
TEST=fixes build

R=robertm@google.com,jasonwkim@google.com

Review URL: http://codereview.chromium.org/6883266

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@5105 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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