Split up ios/web:test_support.

ios/chrome/browser/ui/dialogs/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.
 
 source_set("dialogs") {
   deps = [
     "//base",
     "//ios/web",
   ]
 
   sources = [
     "javascript_dialog_blocking_util.h",
     "javascript_dialog_blocking_util.mm",
   ]
 
   configs += [ "//build/config/compiler:enable_arc" ]
 }
 
 source_set("unit_tests") {
   testonly = true
 
   sources = [
     "javascript_dialog_blocking_util_unittest.mm",
   ]
 
   deps = [
     ":dialogs",
     "//ios/web",
-    "//ios/web:test_support",
+    "//ios/web/public/test/fakes",
     "//testing/gtest",
   ]
 
   configs += [ "//build/config/compiler:enable_arc" ]
 }
 
 source_set("dialogs_internal") {
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "dialog_presenter.h",
@@ skipping 25 matching lines @@
     "dialog_presenter_unittest.mm",
     "nsurl_protection_space_util_unittest.mm",
   ]
   deps = [
     ":dialogs_internal",
     "//base",
     "//components/strings",
     "//ios/chrome/app/strings",
     "//ios/chrome/browser/ui/alert_coordinator",
     "//ios/web",
-    "//ios/web:test_support",
+    "//ios/web/public/test/fakes",
     "//testing/gtest",
     "//ui/base",
     "//url",
   ]
 }
 
 source_set("eg_tests") {
   configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true
   sources = [
     "javascript_dialog_egtest.mm",
   ]
   deps = [
     ":dialogs_internal",
     "//base",
     "//components/strings",
     "//ios/chrome/app/strings",
     "//ios/chrome/browser/ui",
     "//ios/chrome/browser/ui/tools_menu",
     "//ios/chrome/test/app:test_support",
     "//ios/chrome/test/earl_grey:test_support",
     "//ios/testing:ios_test_support",
     "//ios/testing/earl_grey:earl_grey_support",
     "//ios/third_party/earl_grey",
     "//ios/web",
-    "//ios/web:test_support",
+    "//ios/web/public/test",
+    "//ios/web/public/test/http_server",
     "//ui/base",
     "//url",
   ]
   libs = [
     "UIKit.framework",
     "XCTest.framework",
   ]
 }