[Telemetry] Update telemetry_unittests to use tools/perf/run_telemetry_tests

tools/perf/core/path_util.py

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
+import sys
+
+sys.path.insert(1, os.path.join(os.path.abspath(__file__), '..', '..'))
+
+from chrome_telemetry_build import chromium_config
 
 
 def GetChromiumSrcDir():
-  return os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(
-        os.path.abspath(__file__)))))
+  return chromium_config.GetChromiumSrcDir()
+
 
 def GetTelemetryDir():
-  return os.path.join(GetChromiumSrcDir(), 'tools', 'telemetry')
+  return chromium_config.GetTelemetryDir()
+
 
 def GetPerfDir():
   return os.path.join(GetChromiumSrcDir(), 'tools', 'perf')
 
+
 def GetPerfStorySetsDir():
   return os.path.join(GetPerfDir(), 'page_sets')
 
+
 def GetPerfBenchmarksDir():
   return os.path.join(GetPerfDir(), 'benchmarks')
-