[ios clean] Consumer interface for WebContents

ios/clean/chrome/test/BUILD.gn

 # Copyright 2017 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("//testing/test.gni")
 
 group("all_tests") {
   testonly = true
   deps = [
     ":ios_clean_chrome_unittests",
   ]
 }
 
 test("ios_clean_chrome_unittests") {
   deps = [
     "//ios/chrome/test:run_all_unittests",
     "//ios/clean/chrome/browser:unit_tests",
+    "//ios/clean/chrome/browser/ui/web_contents:unit_tests",
   ]
 }