Split up ios/web:test_support.

ios/chrome/browser/ui/first_run/BUILD.gn

 # Copyright 2016 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.
 
 bundle_data("assets") {
   sources = [
     "resources/FirstRun.xcassets/checkbox.imageset/Contents.json",
     "resources/FirstRun.xcassets/checkbox.imageset/checkbox.png",
     "resources/FirstRun.xcassets/checkbox.imageset/checkbox@2x.png",
     "resources/FirstRun.xcassets/checkbox.imageset/checkbox@2x~ipad.png",
@@ skipping 73 matching lines @@
     ":first_run",
     "//base",
     "//components/metrics",
     "//components/prefs",
     "//components/prefs:test_support",
     "//ios/chrome/browser/browser_state:test_support",
     "//ios/chrome/browser/tabs",
     "//ios/chrome/browser/ui",
     "//ios/chrome/browser/ui/fancy_ui",
     "//ios/chrome/test:test_support",
-    "//ios/web:test_support",
+    "//ios/web/public/test:test_support",
     "//testing/gtest",
     "//third_party/ocmock",
   ]
 }
 
 source_set("eg_tests") {
   configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true
   sources = [
     "first_run_egtest.mm",
@@ skipping 12 matching lines @@
     "//ios/chrome/browser/signin",
     "//ios/chrome/browser/sync",
     "//ios/chrome/test/app:test_support",
     "//ios/chrome/test/earl_grey:test_support",
     "//ios/public/provider/chrome/browser/signin:test_support",
     "//ios/third_party/earl_grey",
     "//ui/base",
   ]
   libs = [ "XCTest.framework" ]
 }