Delete all test isolate file.

content/content_site_isolation_browsertests.isolate

Index: content/content_site_isolation_browsertests.isolate
diff --git a/content/content_site_isolation_browsertests.isolate b/content/content_site_isolation_browsertests.isolate
deleted file mode 100644
index 9fcfd9ac72807d74f7b5e9470141957752e98644..0000000000000000000000000000000000000000
--- a/content/content_site_isolation_browsertests.isolate
+++ /dev/null
@@ -1,21 +0,0 @@
-# Copyright 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': [
-    'content_browsertests.isolate',
-  ],
-  'conditions': [
-    ['OS=="linux"', {
-      'variables': {
-        'command': [
-          '../testing/test_env.py',
-          '<(PRODUCT_DIR)/content_browsertests<(EXECUTABLE_SUFFIX)',
-          '--test-launcher-bot-mode',
-					'--site-per-process',
-					'--test-launcher-filter-file=../testing/buildbot/filters/site-per-process.content_browsertests.filter',
-        ],
-      },
-    }],
-  ],
-}