Delete all test isolate file now that M54 was branched.

The runtime dependencies data was successfully transitioned to GN.

Keep non-testing isolate as some projects (v8, webrtc) still need some. They
will be curated incrementally.

Ran:
  $ git rm $(git ls-files -- "*.isolate" | grep -i test | grep -v testserver)
  $ git ls-files -- "*.isolate" | wc -l
  14

TBR=dpranke@chromium.org
BUG=
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2257893002
Cr-Original-Commit-Position: refs/heads/master@{#415954}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 95b6282dd54e942098f39c3e6e2a8553c8b759bd
diff --git a/tools/gn/gn_unittests.isolate b/tools/gn/gn_unittests.isolate
deleted file mode 100644
index cada5a0..0000000
--- a/tools/gn/gn_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)/gn_unittests<(EXECUTABLE_SUFFIX)',
-        ],
-        'files': [
-          'format_test_data/',
-        ],
-      },
-    }],
-  ],
-  'includes': [
-    '../../base/base.isolate',
-  ],
-}