Split up ios/web:test_support.

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

Index: ios/chrome/browser/ui/activity_services/BUILD.gn
diff --git a/ios/chrome/browser/ui/activity_services/BUILD.gn b/ios/chrome/browser/ui/activity_services/BUILD.gn
index e2e750cdb5e04dc22517e449d64245f9b6f103c6..c0fc89f106b67d2d4ecca9374555e8865eff2716 100644
--- a/ios/chrome/browser/ui/activity_services/BUILD.gn
+++ b/ios/chrome/browser/ui/activity_services/BUILD.gn
@@ -85,7 +85,7 @@ source_set("unit_tests") {
     "//ios/chrome/app/strings",
     "//ios/chrome/browser/browser_state:test_support",
     "//ios/chrome/browser/tabs",
-    "//ios/web:test_support",
+    "//ios/web/public/test:test_support",
     "//testing/gtest",
     "//third_party/ocmock",
     "//ui/base",
@@ -109,7 +109,8 @@ source_set("eg_tests") {
     "//ios/chrome/test/earl_grey:test_support",
     "//ios/third_party/material_components_ios",
     "//ios/web:earl_grey_test_support",
-    "//ios/web:test_support",
+    "//ios/web/public/test:test_support",
+    "//ios/web/public/test/response_providers:test_support",
     "//ui/base",
   ]
   libs = [ "XCTest.framework" ]