Revert of Move base_dir to user_story_set, remove file_path.

tools/telemetry/telemetry/user_story/user_story_set.py

Index: tools/telemetry/telemetry/user_story/user_story_set.py
diff --git a/tools/telemetry/telemetry/user_story/user_story_set.py b/tools/telemetry/telemetry/user_story/user_story_set.py
index a160b52602988a20a64a31d57755e49ee848ea90..b4315ffc9e7799afe216fa37bcf115909d0daace 100644
--- a/tools/telemetry/telemetry/user_story/user_story_set.py
+++ b/tools/telemetry/telemetry/user_story/user_story_set.py
@@ -17,7 +17,7 @@
   """
 
   def __init__(self, archive_data_file='', cloud_storage_bucket=None,
-               base_dir=None, serving_dirs=None):
+               serving_dirs=None):
     """Creates a new UserStorySet.
 
     Args:
@@ -33,20 +33,10 @@
     self._wpr_archive_info = None
     archive_info.AssertValidCloudStorageBucket(cloud_storage_bucket)
     self._cloud_storage_bucket = cloud_storage_bucket
-    if base_dir:
-      if not os.path.isdir(base_dir):
-        raise ValueError('Must provide valid directory path for base_dir.')
-      self._base_dir = base_dir
-    else:
-      self._base_dir = os.path.dirname(inspect.getfile(self.__class__))
+    self._base_dir = os.path.dirname(inspect.getfile(self.__class__))
     # Convert any relative serving_dirs to absolute paths.
     self._serving_dirs = set(os.path.realpath(os.path.join(self.base_dir, d))
                              for d in serving_dirs or [])
-
-
-  @property
-  def file_path(self):
-    return inspect.getfile(self.__class__).replace('.pyc', '.py')
 
   @property
   def base_dir(self):