Delete all test isolate file.

chrome/telemetry_gpu_test.isolate

-# Copyright (c) 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=="android" or OS=="linux" or OS=="mac" or OS=="win"', {
-      # This isolate allows any of the GPU tests, including the WebGL
-      # conformance tests, to be run. However, extra command line arguments
-      # must be supplied in order to run any one of them.
-      'variables': {
-        'files': [
-          '../content/test/gpu/',
-          '../content/test/data/gpu/',
-          # For GpuProcess.video
-          '../content/test/data/media/bear.ogv',
-          # For webgl_conformance
-          '../third_party/webgl/',
-          # Other dependencies of the tests and their harness.
-          '../testing/test_env.py',
-          '../testing/xvfb.py',
-          '../testing/scripts/common.py',
-          '../testing/scripts/run_telemetry_benchmark_as_googletest.py',
-        ],
-        'command': [
-          '../testing/scripts/run_telemetry_benchmark_as_googletest.py',
-          '../content/test/gpu/run_gpu_test.py',
-        ],
-      },
-    }],
-  ]
-}