Use the old back button on Terms of Service.

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 37 matching lines @@
     "//ios/chrome/browser",
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/crash_report",
     "//ios/chrome/browser/first_run",
     "//ios/chrome/browser/signin",
     "//ios/chrome/browser/tabs",
     "//ios/chrome/browser/ui",
     "//ios/chrome/browser/ui/authentication",
     "//ios/chrome/browser/ui/commands",
     "//ios/chrome/browser/ui/fancy_ui",
+    "//ios/chrome/browser/ui/icons",
     "//ios/chrome/browser/ui/material_components",
     "//ios/chrome/browser/ui/promos",
     "//ios/chrome/browser/ui/settings",
     "//ios/chrome/browser/ui/sync",
     "//ios/chrome/browser/ui/util",
     "//ios/chrome/common",
     "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser/signin",
     "//ios/third_party/material_components_ios",
     "//ios/third_party/material_roboto_font_loader_ios",
@@ skipping 48 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" ]
 }