Introduce CancelUponDeferral() to buffered media loaders.

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 = [
@@ skipping 74 matching lines @@
 
 if (!is_mac) {
   # TODO(GYP): Make linking this work on the mac.
   test("media_blink_unittests") {
     deps = [
       ":blink",
       "//base",
       "//base/test:test_support",
       "//cc",
       "//cc/blink",
+      "//gin",
       "//media",
       "//media:shared_memory_support",
       "//media/base:test_support",
       "//net",
       "//testing/gmock",
       "//testing/gtest",
       "//third_party/WebKit/public:blink",
       "//ui/gfx/geometry",
       "//ui/gfx:test_support",
       "//url",
@@ skipping 10 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",
     ]
   }
 }