Move enable_app_list to a buildflag.

chrome/browser/chromeos/BUILD.gn

 # Copyright 2014 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("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 assert(is_chromeos)
@@ skipping 44 matching lines @@
     "//chromeos:cryptohome_proto",
     "//chromeos:cryptohome_signkey_proto",
     "//components/arc",
     "//components/certificate_reporting:cert_logger_proto",
     "//components/certificate_reporting:encrypted_cert_logger_proto",
     "//components/drive",
     "//components/drive:drive_chromeos",
     "//components/feedback",
     "//components/flags_ui",
     "//components/login",
+    "//components/metrics/leak_detector",
     "//components/onc",
     "//components/ownership",
     "//components/pairing",
     "//components/policy:generated",
     "//components/proxy_config",
     "//components/safe_browsing_db:metadata_proto",
     "//components/session_manager/core",
     "//components/user_manager",
     "//components/wifi_sync",
 
@@ skipping 1538 matching lines @@
     "policy/proto/chrome_device_policy.proto",
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
   ]
 }