autotest: remove annoying deprecated function.

I got sick of seeing deprecation messages for cros_version_to_label
every time I ran test that.

Removing out of frustration since this appears to be simple.

BUG=None
TEST=Ran test_that, it still worked.

Change-Id: Ibf927e218b0c491234252f50a5189d9a248bda5c
Reviewed-on: https://chromium-review.googlesource.com/498028
Commit-Ready: Justin TerAvest <teravest@chromium.org>
Tested-by: Justin TerAvest <teravest@chromium.org>
Reviewed-by: Allen Li <ayatane@chromium.org>
diff --git a/server/cros/provision.py b/server/cros/provision.py
index 71bec21..a8f63c7 100644
--- a/server/cros/provision.py
+++ b/server/cros/provision.py
@@ -98,19 +98,6 @@
     return get_version_label_prefix(image) + ':' + image
 
 
-def cros_version_to_label(image):
-    """
-    Returns the proper label name for a ChromeOS build of |image|.
-
-    @param image: A string of the form 'lumpy-release/R28-3993.0.0'
-    @returns: A string that is the appropriate label name.
-
-    """
-    warnings.warn('cros_version_to_label is deprecated', stacklevel=2)
-    keyval_label = labellib.KeyvalLabel(Key.CROS_VERSION, image)
-    return labellib.format_keyval_label(keyval_label)
-
-
 def fwro_version_to_label(image):
     """
     Returns the proper label name for a RO firmware build of |image|.
diff --git a/site_utils/test_runner_utils.py b/site_utils/test_runner_utils.py
index 56e71e2..4548325 100755
--- a/site_utils/test_runner_utils.py
+++ b/site_utils/test_runner_utils.py
@@ -28,6 +28,7 @@
 from autotest_lib.server import autoserv_utils
 from autotest_lib.server import server_logging_config
 from autotest_lib.server import utils
+from autotest_lib.utils import labellib
 
 
 _autoserv_proc = None
@@ -476,7 +477,9 @@
               provision failed prior to running any jobs.
     """
     # Create host in afe, add board and build labels.
-    cros_version_label = provision.cros_version_to_label(build)
+    cros_version_label = labellib.format_keyval_label(
+        labellib.KeyvalLabel(labellib.Key.CROS_VERSION, build))
+
     build_label = afe.create_label(cros_version_label)
     board_label = afe.create_label(constants.BOARD_PREFIX + board)
     new_host = afe.create_host(remote)