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

media/blink/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("//testing/test.gni")
+
 component("blink") {
   output_name = "media_blink"
 
   deps = [
     "//base",
     "//cc",
     "//cc/blink",
     "//gpu/blink",
     "//media",
     "//media:shared_memory_support",
@@ skipping 95 matching lines @@
       "mock_weburlloader.cc",
       "mock_weburlloader.h",
       "run_all_unittests.cc",
       "test_response_generator.cc",
       "test_response_generator.h",
       "video_frame_compositor_unittest.cc",
       "webaudiosourceprovider_impl_unittest.cc",
     ]
   }
 }