[Android] Fix KillHostHeartbeat for numerical user IDs.

BUG=405033

Review URL: https://codereview.chromium.org/490563002

git-svn-id: http://src.chromium.org/svn/trunk/src/build@290615 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

android/provision_devices.py

@@ -36,7 +36,7 @@ def KillHostHeartbeat():
   matches = re.findall('\\n.*host_heartbeat.*', stdout)
   for match in matches:
     logging.info('An instance of host heart beart running... will kill')
-    pid = re.findall('(\d+)', match)[0]
+    pid = re.findall('(\S+)', match)[1]
     subprocess.call(['kill', str(pid)])