cros-asan: Fix a crash in chromeos asan bots.

The error reported is:
  ERROR logging_AsanCrash logging_AsanCrash timestamp=... localtime=... Unhandled ImportError: /usr/local/autotest/deps/pyauto_dep/test_src/out/Release/_pyautolib.so: undefined symbol: __asan_unpoison_memory_region
  Traceback (most recent call last):
  File /usr/local/autotest/common_lib/test.py, line 480, in _exec
  _cherry_pick_call(self.initialize, *args, **dargs)
  ...

BUG=none
R=yunlian@chromium.org
TBR=sky@chromium.org

Review URL: https://codereview.chromium.org/139303019

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245787 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245787