[chromedriver] Prefix server logs with chromedriver_log_.

chrome/test/chromedriver/run_buildbot_steps.py

Index: chrome/test/chromedriver/run_buildbot_steps.py
diff --git a/chrome/test/chromedriver/run_buildbot_steps.py b/chrome/test/chromedriver/run_buildbot_steps.py
index bf973fb019f64e8183db0f631be9f19edb240922..37b2358eba394b3ed884429166470caee0e0e601 100755
--- a/chrome/test/chromedriver/run_buildbot_steps.py
+++ b/chrome/test/chromedriver/run_buildbot_steps.py
@@ -67,13 +67,14 @@ def _ArchiveServerLogs():
   """Uploads chromedriver server logs to google storage."""
   util.MarkBuildStepStart('archive chromedriver server logs')
   for server_log in glob.glob(os.path.join(tempfile.gettempdir(),
-                                           'chromedriver_*')):
-    base_name = os.path.basename(server_log)
-    util.AddLink(base_name, '%s/%s' % (SERVER_LOGS_LINK, base_name))
-    slave_utils.GSUtilCopy(
-        server_log,
-        '%s/%s' % (GS_SERVER_LOGS_URL, base_name),
-        mimetype='text/plain')
+                                           'chromedriver_log_*')):
+    if os.path.isfile(server_log):
+      base_name = os.path.basename(server_log)
+      util.AddLink(base_name, '%s/%s' % (SERVER_LOGS_LINK, base_name))
+      slave_utils.GSUtilCopy(
+          server_log,
+          '%s/%s' % (GS_SERVER_LOGS_URL, base_name),
+          mimetype='text/plain')
 
 
 def _DownloadPrebuilts():