Prevent ProcessTest::ResetPidByFile from killing any innocent process.

TEST=Tested the following:
1. FEATURES=test emerge-$BOARD platform2
2. Run libchromeos-180609_unittests and libchromeos-242728_unittests
   under strace and verify that the ProcessTest::ResetPidByFile unit
   test doesn't send SIGKILL to a random process with pid 456.

Change-Id: If304c1ad1aa64eddf68304438d03325c28732c35
Tested-by: Ben Chan <>
Reviewed-by: David James <>
Reviewed-by: Mike Frysinger <>
Commit-Queue: Ben Chan <>
2 files changed