Moved the FakeDownloadItem to content/public/test.

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")
@@ skipping 37 matching lines @@
     "../public/test/browser_side_navigation_test_utils.h",
     "../public/test/browser_test.h",
     "../public/test/browser_test_base.cc",
     "../public/test/browser_test_base.h",
     "../public/test/browser_test_utils.cc",
     "../public/test/browser_test_utils.h",
     "../public/test/content_test_suite_base.cc",
     "../public/test/content_test_suite_base.h",
     "../public/test/download_test_observer.cc",
     "../public/test/download_test_observer.h",
+    "../public/test/fake_download_item.cc",
+    "../public/test/fake_download_item.h",
     "../public/test/fake_speech_recognition_manager.cc",
     "../public/test/fake_speech_recognition_manager.h",
     "../public/test/find_test_utils.cc",
     "../public/test/find_test_utils.h",
     "../public/test/frame_load_waiter.cc",
     "../public/test/frame_load_waiter.h",
     "../public/test/javascript_test_observer.cc",
     "../public/test/javascript_test_observer.h",
     "../public/test/memory_coordinator_test_utils.cc",
     "../public/test/memory_coordinator_test_utils.h",
@@ skipping 1761 matching lines @@
   if (is_android) {
     deps += [ "//testing/android/native_test:native_test_native_code" ]
   }
 }
 
 group("fuzzers") {
   deps = [
     "//content/test/fuzzer",
   ]
 }