Revert "Replace autotest.tar.bz2 with autotest.tar at Dev server"

No control files are found in the autotest.tar. Reverting for now. 

This reverts commit d4d426532ea2286ef53dc2550200d53b93fc621c

Change-Id: Ic2cbe8c64a4b444e8c4ca669056ca43ac5abf461
Reviewed-on: https://gerrit.chromium.org/gerrit/27015
Commit-Ready: Scott Zawalski <scottz@chromium.org>
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Tested-by: Scott Zawalski <scottz@chromium.org>
diff --git a/downloadable_artifact.py b/downloadable_artifact.py
index 1936e2b..bf16885 100644
--- a/downloadable_artifact.py
+++ b/downloadable_artifact.py
@@ -17,7 +17,7 @@
 STATEFUL_UPDATE = 'stateful.tgz'
 TEST_IMAGE = 'chromiumos_test_image.bin'
 ROOT_UPDATE = 'update.gz'
-AUTOTEST_PACKAGE = 'autotest.tar'
+AUTOTEST_PACKAGE = 'autotest.tar.bz2'
 TEST_SUITES_PACKAGE = 'test_suites.tar.bz2'
 
 
@@ -109,17 +109,6 @@
 class AutotestTarball(Tarball):
   """Wrapper around the autotest tarball to download from gsutil."""
 
-  def _ExtractTarball(self, exclude=None):
-    """Extracts the tarball into the install_path with optional exclude path."""
-    exclude_str = '--exclude=%s' % exclude if exclude else ''
-    cmd = 'tar xf %s %s --directory=%s' % (
-        self._tmp_stage_path, exclude_str, self._install_path)
-    msg = 'An error occurred when attempting to untar %s' % self._tmp_stage_path
-    try:
-      subprocess.check_call(cmd, shell=True)
-    except subprocess.CalledProcessError, e:
-      raise ArtifactDownloadError('%s %s' % (msg, e))
-
   def Stage(self):
     """Untars the autotest tarball into the install path excluding test suites.
     """