Revert of Introduce mkgrokdump to update tools/v8heapconst.py.

test/mkgrokdump/mkgrokdump.isolate

Index: test/mkgrokdump/mkgrokdump.isolate
diff --git a/test/mkgrokdump/mkgrokdump.isolate b/test/mkgrokdump/mkgrokdump.isolate
deleted file mode 100644
index b2cbc3255178f697ef6409ccca7ebb44e69413b7..0000000000000000000000000000000000000000
--- a/test/mkgrokdump/mkgrokdump.isolate
+++ /dev/null
@@ -1,17 +0,0 @@
-# Copyright 2017 the V8 project authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-{
-  'variables': {
-    'files': [
-      './mkgrokdump.status',
-      './testcfg.py',
-      '../../tools/v8heapconst.py',
-      '<(PRODUCT_DIR)/mkgrokdump<(EXECUTABLE_SUFFIX)',
-    ],
-  },
-  'includes': [
-    '../../src/base.isolate',
-    '../../tools/testrunner/testrunner.isolate',
-  ],
-}