adb_profile_chrome: Check in perf-to-tracing conversion script

tools/android/adb_profile_chrome/perf_controller_unittest.py

 # Copyright 2014 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 json
 
 from adb_profile_chrome import controllers_unittest
 from adb_profile_chrome import perf_controller
 from adb_profile_chrome import ui
@@ skipping 17 matching lines @@
     controller = perf_controller.PerfProfilerController(self.device,
                                                         categories)
 
     interval = 1
     try:
       controller.StartTracing(interval)
     finally:
       controller.StopTracing()
 
     result = controller.PullTrace()
-    # Perf-to-JSON conversion can fail if dependencies are missing.
-    if not result:
-      perf_script_path = os.path.join(constants.DIR_SOURCE_ROOT,
-          'tools', 'telemetry', 'telemetry', 'core', 'platform', 'profiler',
-          'perf_vis', 'perf_to_tracing.py')
-      assert not os.path.exists(perf_script_path)
-      return
-
     try:
       with open(result) as f:
         json.loads(f.read())
     finally:
       os.remove(result)