Move base_dir to user_story_set, remove file_path.

tools/telemetry/telemetry/user_story/user_story_set_unittest.py

Index: tools/telemetry/telemetry/user_story/user_story_set_unittest.py
diff --git a/tools/telemetry/telemetry/user_story/user_story_set_unittest.py b/tools/telemetry/telemetry/user_story/user_story_set_unittest.py
index be7d10380f16e20ac85f1655c4f296910948f42c..fd8b6b19b928fd220bc4138fcc802753ac7831f6 100644
--- a/tools/telemetry/telemetry/user_story/user_story_set_unittest.py
+++ b/tools/telemetry/telemetry/user_story/user_story_set_unittest.py
@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import inspect
 import os
 import unittest
 
@@ -14,6 +15,11 @@ class UserStorySetFoo(user_story_set.UserStorySet):
   pass
 
 
+class MockUserStorySet(user_story_set.UserStorySet):
+  def __init__(self):
+    super(MockUserStorySet, self).__init__()
+
+
 class UserStorySetTest(unittest.TestCase):
 
   def testUserStoryTestName(self):
@@ -30,6 +36,11 @@ class UserStorySetTest(unittest.TestCase):
     self.assertTrue(os.path.isdir(base_dir))
     self.assertEqual(base_dir, os.path.dirname(__file__))
 
+  def testFilePath(self):
+      uss = MockUserStorySet()
+      self.assertEqual(os.path.abspath(__file__),
+                       uss.file_path)
+
   def testCloudBucket(self):
     blank_uss = user_story_set.UserStorySet()
     self.assertEqual(blank_uss.bucket, None)