[ios] Adds unittests that were inadvertently not compiled or run.

ios/chrome/BUILD.gn

 # Copyright 2015 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("//ios/build/config.gni")
 import("//testing/test.gni")
 
 test("ios_chrome_unittests") {
   deps = [
     # Ensure that all unit tests are run.
@@ skipping 13 matching lines @@
     "//ios/chrome/browser/browsing_data:unit_tests",
     "//ios/chrome/browser/device_sharing:unit_tests",
     "//ios/chrome/browser/favicon:unit_tests",
     "//ios/chrome/browser/geolocation:unit_tests",
     "//ios/chrome/browser/itunes_links:unit_tests",
     "//ios/chrome/browser/metrics:unit_tests",
     "//ios/chrome/browser/native_app_launcher:unit_tests",
     "//ios/chrome/browser/net:unit_tests",
     "//ios/chrome/browser/passwords:unit_tests",
     "//ios/chrome/browser/reading_list:unit_tests",
+    "//ios/chrome/browser/signin:unit_tests",
     "//ios/chrome/browser/snapshots:unit_tests",
     "//ios/chrome/browser/ssl:unit_tests",
     "//ios/chrome/browser/suggestions:unit_tests",
     "//ios/chrome/browser/sync:unit_tests",
     "//ios/chrome/browser/translate:unit_tests",
     "//ios/chrome/browser/u2f:unit_tests",
     "//ios/chrome/browser/ui:unit_tests",
     "//ios/chrome/browser/ui/alert_coordinator:unit_tests",
     "//ios/chrome/browser/ui/commands:unit_tests",
     "//ios/chrome/browser/ui/context_menu:unit_tests",
     "//ios/chrome/browser/ui/dialogs:unit_tests",
     "//ios/chrome/browser/ui/elements:unit_tests",
     "//ios/chrome/browser/ui/keyboard:unit_tests",
     "//ios/chrome/browser/ui/voice:unit_tests",
     "//ios/chrome/browser/update_client:unit_tests",
     "//ios/chrome/browser/voice:unit_tests",
     "//ios/chrome/browser/web_resource:unit_tests",
     "//ios/chrome/common:unit_tests",
     "//ios/chrome/test:unit_tests",
     "//ios/chrome/test/base:unit_tests",
+    "//ios/web/public/image_fetcher:unit_tests",
   ]
 
   assert_no_deps = ios_assert_no_deps
 }