Revert of Add bisect config validation.

scripts/slave/recipe_modules/auto_bisect/bisector.py

Index: scripts/slave/recipe_modules/auto_bisect/bisector.py
diff --git a/scripts/slave/recipe_modules/auto_bisect/bisector.py b/scripts/slave/recipe_modules/auto_bisect/bisector.py
index cd5b59b2526d53b6d0d04e95d31e2aa15233e2fc..b2002b08ce0931a0639d6a13743388ed0a833c87 100644
--- a/scripts/slave/recipe_modules/auto_bisect/bisector.py
+++ b/scripts/slave/recipe_modules/auto_bisect/bisector.py
@@ -7,7 +7,6 @@
 import time
 import urllib
 
-from . import config_validation
 from . import depot_config
 from . import revision_state
 
@@ -76,12 +75,11 @@
     """
     super(Bisector, self).__init__()
     self._api = api
-    self.result_codes = set()
     self.ensure_sync_master_branch()
     self.bisect_config = bisect_config
     self.config_step()
-    self._validate_config()
     self.revision_class = revision_class
+    self.result_codes = set()
     self.last_tested_revision = None
 
     # Test-only properties.
@@ -191,9 +189,8 @@
     return significantly_different
 
   def config_step(self):
-    """Yields a step that prints the bisect config."""
+    """Yields a simple echo step that outputs the bisect config."""
     api = self.api
-
     # bisect_config may come as a FrozenDict (which is not serializable).
     bisect_config = dict(self.bisect_config)
 
@@ -204,22 +201,12 @@
     for k, v in bisect_config.iteritems():
       if isinstance(v, basestring):
         bisect_config[k] = fix_windows_backslashes(v)
-
     # We sort the keys to prevent problems with orders changing when
     # recipe_simulation_test compares against expectation files.
     config_string = json.dumps(bisect_config, indent=2, sort_keys=True)
-    step = api.m.step('config', [])
+    result = api.m.step('config', [])
     config_lines = config_string.splitlines()
-    step.presentation.logs['Bisect job configuration'] = config_lines
-
-  def _validate_config(self):
-    """Raises an error and halts the bisect job if the config is invalid."""
-    try:
-      config_validation.validate_bisect_config(self.bisect_config)
-    except config_validation.ValidationFail as error:
-      self.surface_result('BAD_CONFIG')
-      self.api.m.halt(error.message)
-      raise self.api.m.step.StepFailure(error.message)
+    result.presentation.logs['Bisect job configuration'] = config_lines
 
   @property
   def api(self):