[ObjC ARC] Converts ios/chrome/browser/ui/history:eg_tests to ARC.

ios/chrome/browser/ui/history/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("history") {
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "clear_browsing_bar.h",
     "clear_browsing_bar.mm",
     "favicon_view.h",
@@ skipping 178 matching lines @@
   sources = [
     "//ios/chrome/test/data/favicon/test_favicon.png",
   ]
   outputs = [
     "{{bundle_resources_dir}}/" +
         "ios/chrome/test/data/favicon/{{source_file_part}}",
   ]
 }
 
 source_set("eg_tests") {
+  configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true
   sources = [
     "history_ui_egtest.mm",
     "tab_history_popup_controller_egtest.mm",
   ]
   deps = [
     ":history",
     "//base",
     "//components/browsing_data/core",
     "//components/prefs",
@@ skipping 13 matching lines @@
     "//ios/third_party/earl_grey",
     "//ios/web:test_support",
     "//net",
     "//ui/base",
   ]
   libs = [
     "UIKit.framework",
     "XCTest.framework",
   ]
 }