Append variation headers when fetching snippets.

components/ntp_snippets/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/ui.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
@@ skipping 41 matching lines @@
     "//net",
     "//url",
   ]
 
   deps = [
     "//components/data_use_measurement/core",
     "//components/image_fetcher",
     "//components/metrics",
     "//components/ntp_snippets/proto",
     "//components/variations",
+    "//components/variations/net",
     "//third_party/icu/",
     "//ui/gfx",
   ]
 }
 
 if (is_android) {
   java_cpp_enum("ntp_snippets_java_enums_srcjar") {
     sources = [
       "ntp_snippets_status_service.h",
     ]
@@ skipping 20 matching lines @@
     "//components/leveldb_proto:test_support",
     "//components/signin/core/browser:test_support",
     "//components/signin/core/common",
     "//components/sync_driver:test_support",
     "//components/variations",
     "//net:test_support",
     "//testing/gtest",
     "//third_party/icu/",
   ]
 }