Revert of Convert ppapi_unittests to run exclusively on Swarming

ppapi/ppapi_unittests.isolate

Index: ppapi/ppapi_unittests.isolate
diff --git a/ppapi/ppapi_unittests.isolate b/ppapi/ppapi_unittests.isolate
deleted file mode 100644
index 1e2e0736dd3fb3f3f1d3d8b03bd8cd954a103259..0000000000000000000000000000000000000000
--- a/ppapi/ppapi_unittests.isolate
+++ /dev/null
@@ -1,20 +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.
-{
-  'conditions': [
-    ['OS=="linux" or OS=="mac" or OS=="win"', {
-      'variables': {
-        'command': [
-          '<(PRODUCT_DIR)/ppapi_unittests<(EXECUTABLE_SUFFIX)',
-        ],
-        'files': [
-          '<(PRODUCT_DIR)/ppapi_unittests<(EXECUTABLE_SUFFIX)',
-        ],
-      },
-    }],
-  ],
-  'includes': [
-    '../base/base.isolate',
-  ],
-}