Change test size of nacl_host_desc_big_file_test to huge.
Change test size of nacl_host_desc_big_file_test to huge.

The Windows bot sometimes flake out with test size as 'big'.

BUG= None (occasional bot flake)
TEST= None
R=bradnelson@google.com

Review URL: https://codereview.chromium.org/19284002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@11764 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client,Lind-Project/native_client