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

ios/chrome/browser/ui/find_bar/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("resources") {
   sources = [
     "resources/find_bg@2x~ipad.png",
     "resources/find_bg~ipad.png",
     "resources/find_close.png",
     "resources/find_close@2x.png",
@@ skipping 40 matching lines @@
     "resources/find_prev_pressed_incognito.png",
     "resources/find_prev_pressed_incognito@2x.png",
     "resources/find_prev_pressed_incognito@3x.png",
   ]
   outputs = [
     "{{bundle_resources_dir}}/{{source_file_part}}",
   ]
 }
 
 source_set("find_bar") {
+  configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "find_bar_controller_ios.h",
     "find_bar_controller_ios.mm",
     "find_bar_touch_forwarding_view.h",
     "find_bar_touch_forwarding_view.mm",
     "find_bar_view.h",
     "find_bar_view.mm",
   ]
   deps = [
     ":resources",
@@ skipping 24 matching lines @@
     "//ios/chrome/browser/find_in_page",
     "//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/web:test_support",
     "//ui/base",
   ]
   libs = [ "XCTest.framework" ]
 }