Disable Quarantine tests on platforms its not supported.

content/test/BUILD.gn

 # Copyright 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.
 
 import("//build/config/chrome_build.gni")
+import("//build/config/chromecast_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//ppapi/features/features.gni")
 import("//services/service_manager/public/service_manifest.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/public/public_features.gni")
@@ skipping 1295 matching lines @@
     "../common/manifest_util_unittest.cc",
     "../common/navigation_params_unittest.cc",
     "../common/origin_trials/trial_token_unittest.cc",
     "../common/origin_trials/trial_token_validator_unittest.cc",
     "../common/origin_util_unittest.cc",
     "../common/page_state_serialization_unittest.cc",
     "../common/page_zoom_unittest.cc",
     "../common/plugin_list_unittest.cc",
     "../common/quarantine/quarantine_linux_unittest.cc",
     "../common/quarantine/quarantine_mac_unittest.mm",
-    "../common/quarantine/quarantine_unittest.cc",
     "../common/quarantine/quarantine_win_unittest.cc",
     "../common/sandbox_mac_compiler_unittest.mm",
     "../common/sandbox_mac_diraccess_unittest.mm",
     "../common/sandbox_mac_fontloading_unittest.mm",
     "../common/sandbox_mac_system_access_unittest.mm",
     "../common/sandbox_mac_unittest_helper.h",
     "../common/sandbox_mac_unittest_helper.mm",
     "../common/service_worker/service_worker_utils_unittest.cc",
     "../common/webplugininfo_unittest.cc",
     "../renderer/android/disambiguation_popup_helper_unittest.cc",
@@ skipping 30 matching lines @@
     "../renderer/render_widget_unittest.cc",
     "../renderer/scheduler/resource_dispatch_throttler_unittest.cc",
     "../renderer/skia_benchmarking_extension_unittest.cc",
     "fileapi_test_file_set.cc",
     "fileapi_test_file_set.h",
     "image_decoder_test.cc",
     "image_decoder_test.h",
     "run_all_unittests.cc",
   ]
 
+  # Chromecasts do not have extended attributes enabled; even if it were
+  # enabled, the devices use tmpfs which restricts the extended attributes that
+  # can be set such that quarantining still would not work. (The platform
+  # specific tests include a runtime guard to skip tests that need xattr.)
+  if (!is_chromecast) {
+    sources += [ "../common/quarantine/quarantine_unittest.cc" ]
+  }
+
   # ChromeOS also defines linux but their memory-monitors conflict.
   if (is_chromeos) {
     sources += [ "../browser/memory/memory_monitor_chromeos_unittest.cc" ]
   } else {
     sources += [ "../browser/memory/memory_monitor_linux_unittest.cc" ]
   }
 
   if (is_android || is_linux || is_mac || is_win) {
     data = [
       "$root_out_dir/content_shell.pak",
@@ skipping 381 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }