[Android] Switch instrumentation tests to generated device isolates.

content/content_shell_test_data.isolate

Index: content/content_shell_test_data.isolate
diff --git a/content/content_shell_test_data.isolate b/content/content_shell_test_data.isolate
deleted file mode 100644
index 72d4d7c0f402852f8812ae935c6261c6a882570b..0000000000000000000000000000000000000000
--- a/content/content_shell_test_data.isolate
+++ /dev/null
@@ -1,17 +0,0 @@
-# Copyright (c) 2014 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.
-{
-  'variables': {
-    'files': [
-      '<(DEPTH)/content/test/data/android/',
-      '<(DEPTH)/content/test/data/media/session/',
-      '<(DEPTH)/net/data/ssl/certificates/crit-codeSigning-chain.pem',
-      '<(DEPTH)/net/data/ssl/certificates/eku-test-root.pem',
-      '<(DEPTH)/net/data/ssl/certificates/invalid_key_usage_cert.der',
-      '<(DEPTH)/net/data/ssl/certificates/non-crit-codeSigning-chain.pem',
-      '<(DEPTH)/net/data/ssl/certificates/ok_cert.pem',
-      '<(DEPTH)/net/data/ssl/certificates/root_ca_cert.pem',
-    ],
-  },
-}