Nail down the expectations in nacl_signal_unittest more precisely.
Nail down the expectations in nacl_signal_unittest more precisely.

r10743 and r10790 both resisted adding expectations for multiple possible
signals, instead determining which signal was expected under the test
conditions and looking for that signal exactly. nacl_signal_unittest was
a bit sloppier, but its expectations can be set in the same way.

TEST=scons run_nacl_signal_test
Review URL: https://codereview.chromium.org/12262041

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@10815 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