Moved the FakeDownloadItem to content/public/test.

chrome/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/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 3463 matching lines @@
   defines = []
 
   deps = [
     ":test_support",
     ":test_support_unit",
     "//base/test:test_support",
     "//chrome:browser_dependencies",
     "//chrome:child_dependencies",
     "//chrome:resources",
     "//chrome:strings",
-    "//chrome/browser/ntp_snippets:test_support",
     "//chrome/common:test_support",
     "//components/autofill/content/renderer:test_support",
     "//components/browser_sync:test_support",
     "//components/component_updater:test_support",
     "//components/content_settings/core/test:test_support",
     "//components/content_settings/core/test:test_support",
     "//components/data_reduction_proxy/core/browser:test_support",
     "//components/data_use_measurement/core",
     "//components/metrics/proto",
     "//components/ntp_snippets:test_support",
@@ skipping 1687 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }