Bisect config params should alway be empty.

BUG=
NOTRY=true

Review URL: https://codereview.chromium.org/537413002

Cr-Commit-Position: refs/heads/master@{#293307}

tools/auto_bisect/bisect.cfg

@@ -59,17 +59,13 @@ config = {
 """
 
 config = {
-  'max_time_minutes': '20',
-  'metric': 'Total/Total',
-  'builder_port': '8341',
-  'bug_id': '405188',
-  'repeat_count': '20',
-  'good_revision': '288423',
-  'builder_host': 'master4.golo.chromium.org',
-  'truncate_percent': '25',
-  'command': 'tools/perf/run_benchmark -v --browser=release sunspider',
-  'gs_bucket': 'chrome-perf',
-  'bad_revision': '288447',
+  'command': '',
+  'good_revision': '',
+  'bad_revision': '',
+  'metric': '',
+  'repeat_count': '',
+  'max_time_minutes': '',
+  'truncate_percent': '',
 }
 
 # Workaround git try issue, see crbug.com/257689