Fix strace lines parsing when a process is forcibly killed during outstanding calls.
Fix strace lines parsing when a process is forcibly killed during outstanding calls.

This happened with unit_tests.

R=rogerta@chromium.org
BUG=98834
TEST=strace parsing works all the time


Review URL: http://codereview.chromium.org/9956019

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@131283 0039d316-1c4b-4281-b951-d872f2087c98

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