Update references to tools/telemetry in .gn, .gyp & .isolate files

tools/perf/core/telemetry_dependencies_unittest.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.
 
 # TODO(eakuefner): Remove this test once Telemetry lives in Catapult.
 import os
 import platform
 import sys
 import unittest
 
 from telemetry.internal.util import path
 
 from core import find_dependencies
 from core import path_util
 
 _TELEMETRY_DEPS = [
-    'third_party/catapult/',
-    'tools/telemetry/']
+  'third_party/catapult/',
+]
 
 
 def _GetCurrentTelemetryDependencies():
   parser = find_dependencies.FindDependenciesCommand.CreateParser()
   find_dependencies.FindDependenciesCommand.AddCommandLineArgs(parser, None)
   options, args = parser.parse_args([''])
   options.positional_args = args
   return find_dependencies.FindDependencies([], options=options)
 
 
@@ skipping 24 matching lines @@
         if platform.system() != 'Darwin':
           self.fail(
               'Your patch adds new dependencies to telemetry. Please contact '
               'aiolos@,dtu@, or nednguyen@ on how to proceed with this change. '
               'Extra dependencies:\n%s' % '\n'.join(extra_dep_paths))
         else:
           print ('Dependencies check failed on mac platform. Extra deps: %s\n'
                  ' sys.path: %s' % (extra_dep_paths, sys.path))
     except ImportError:   # crbug.com/559527
       pass