Re-enable read sandboxing for ARM.  Not yet validating that it is required. BUG= http://code.google.com/p/nativeclient/issues/detail?id=2129 TEST= utman-test.sh toolchain bot script. Review URL: http://codereview.chromium.org/7976038
Re-enable read sandboxing for ARM.  Not yet validating that it is required.
BUG= http://code.google.com/p/nativeclient/issues/detail?id=2129
TEST= utman-test.sh toolchain bot script.
Review URL: http://codereview.chromium.org/7976038

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@6882 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

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