Revert of Run telemetry_perf_unittests via isolate on "Mac tests", "Linux tests" and trybot with swarming

tools/perf/perf.isolate

Index: tools/perf/perf.isolate
diff --git a/tools/perf/perf.isolate b/tools/perf/perf.isolate
deleted file mode 100644
index 520864fdba226af6435de8428d9058e83e805f47..0000000000000000000000000000000000000000
--- a/tools/perf/perf.isolate
+++ /dev/null
@@ -1,19 +0,0 @@
-# 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': [
-    './chrome_telemetry_build/telemetry_chrome_test.isolate',
-  ],
-  'conditions': [
-    ['OS=="android" or OS=="linux" or OS=="mac" or OS=="win"', {
-      'variables': {
-        'files': [
-          './',
-          # Field trial configs
-          '../variations/',
-        ],
-      },
-    }],
-  ]
-}