Delete all test isolate file.

chrome/telemetry_unittests.isolate

-# 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.
-{
-  'includes': [
-    '../tools/perf/chrome_telemetry_build/telemetry_chrome_test.isolate',
-  ],
-  'conditions': [
-    ['OS=="mac" or OS=="win"', {
-      'variables': {
-        'files': [
-          '../tools/perf/run_telemetry_tests',
-          # Other dependencies of the tests and their harness.
-          '../testing/test_env.py',
-          '../testing/xvfb.py',
-          '../testing/scripts/common.py',
-          '../testing/scripts/run_telemetry_as_googletest.py',
-        ],
-        'command': [
-          '../testing/scripts/run_telemetry_as_googletest.py',
-          '../tools/perf/run_telemetry_tests',
-          '-v',
-        ],
-      },
-    }],
-  ]
-}