Disable Chrome Extension tests.
Disable Chrome Extension tests.

This brings in a change to disable nacl chrome extension tests which
appear to be flaky on Windows which caused the original CL to fail.

See: http://codereview.chromium.org/8671003
TBR= ncbray@google.com
Review URL: http://codereview.chromium.org/8712002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@7283 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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