Move the test template to //testing/test.gni (part 2)

components/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/features.gni")
 import("//build/config/ui.gni")
+import("//testing/rules.gni")
 
 # Collection of all components. You wouldn't link to this, but this is rather
 # to reference the files so they can be compiled by the build system.
 group("all_components") {
   testonly = true  # You shouldn't actually link to this.
   visibility = [ "//:*" ]  # Only for the root targets to bring in.
 
   deps = [
     "//components/auto_login_parser",
     "//components/autofill/content/browser",
@@ skipping 243 matching lines @@
   #'breakpad/app/crash_keys_win_unittest.cc',
 
   # Precache tests need these defines.
   #configs += [ "//components/precache/core:precache_config" ]
 
   if (toolkit_views) {
     # TODO(GYP) enable this as above.
     #deps += [ "//components/constrained_window:unit_tests" ]
   }
 }