[ObjC ARC] Converts ios/chrome/browser/find_in_page:unit_tests_nonarc to ARC.

ios/chrome/browser/find_in_page/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.
 
 import("//ios/web/js_compile.gni")
 
 source_set("find_in_page") {
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "find_in_page_controller.h",
@@ skipping 19 matching lines @@
 js_compile_unchecked("injected_js") {
   sources = [
     "resources/find_in_page.js",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
+    "find_in_page_js_unittest.mm",
     "find_tab_helper_unittest.mm",
+    "js_findinpage_manager_unittest.mm",
   ]
   deps = [
     ":find_in_page",
-    ":unit_tests_nonarc",
     "//base",
     "//base/test:test_support",
     "//ios/chrome/browser/web:test_support",
     "//ios/web",
     "//ios/web/public/test",
     "//ios/web/public/test/fakes",
     "//testing/gtest",
   ]
 }
-
-source_set("unit_tests_nonarc") {
-  testonly = true
-  sources = [
-    "find_in_page_js_unittest.mm",
-    "js_findinpage_manager_unittest.mm",
-  ]
-  deps = [
-    ":find_in_page",
-    "//base",
-    "//base/test:test_support",
-    "//ios/chrome/browser/web:test_support",
-    "//ios/web",
-    "//testing/gtest",
-  ]
-}