ntp_snippets: default to staging API on dev/canary

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 71 matching lines @@
   ]
 
   public_deps = [
     "//base",
     "//components/keyed_service/core",
     "//components/leveldb_proto",
     "//components/prefs",
     "//components/resources",
     "//components/signin/core/browser",
     "//components/sync",
+    "//components/version_info",
     "//google_apis",
     "//net",
     "//ui/base",
     "//url",
   ]
 
   deps = [
     "//components/bookmarks/browser",
     "//components/data_use_measurement/core",
     "//components/history/core/browser",
@@ skipping 96 matching lines @@
 
   deps = [
     ":ntp_snippets",
     "//base",
     "//components/offline_pages/core",
     "//components/offline_pages/core:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }