Revert of Update fieldtrial_util To Handle Combined Fieldtrial Config Format

tools/variations/fieldtrial_to_struct.py

Index: tools/variations/fieldtrial_to_struct.py
diff --git a/tools/variations/fieldtrial_to_struct.py b/tools/variations/fieldtrial_to_struct.py
index dec472d7fa04cba6b0210fd05b4e3bfb88fd6888..132f0aa1ca154322f8ac7f7a31a6b687e3e8973d 100755
--- a/tools/variations/fieldtrial_to_struct.py
+++ b/tools/variations/fieldtrial_to_struct.py
@@ -74,15 +74,11 @@
     if study['experiments']:
       yield study
 
-def ConfigToStudies(config, platform):
-  """Returns the applicable studies from config for the platform."""
-  return [study for study in _GenerateTrials(config, platform)]
-
 def _FieldTrialConfigToDescription(config, platform):
   return {
     'elements': {
       'kFieldTrialConfig': {
-        'studies': ConfigToStudies(config, platform)
+        'studies': [study for study in _GenerateTrials(config, platform)]
       }
     }
   }