Revert of arc: enable Android tracing from chrome://tracing in dev mode

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("//extensions/features/features.gni")
 import("//media/media_options.gni")
 import("//printing/features/features.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 295 matching lines @@
     "arc/policy/arc_policy_bridge.cc",
     "arc/policy/arc_policy_bridge.h",
     "arc/policy/arc_policy_util.cc",
     "arc/policy/arc_policy_util.h",
     "arc/print/arc_print_service.cc",
     "arc/print/arc_print_service.h",
     "arc/process/arc_process.cc",
     "arc/process/arc_process.h",
     "arc/process/arc_process_service.cc",
     "arc/process/arc_process_service.h",
-    "arc/tracing/arc_tracing_bridge.cc",
-    "arc/tracing/arc_tracing_bridge.h",
     "arc/tts/arc_tts_service.cc",
     "arc/tts/arc_tts_service.h",
     "arc/video/gpu_arc_video_service_host.cc",
     "arc/video/gpu_arc_video_service_host.h",
     "arc/wallpaper/arc_wallpaper_service.cc",
     "arc/wallpaper/arc_wallpaper_service.h",
     "attestation/attestation_ca_client.cc",
     "attestation/attestation_ca_client.h",
     "attestation/attestation_policy_observer.cc",
     "attestation/attestation_policy_observer.h",
@@ skipping 1468 matching lines @@
     "policy/proto/chrome_device_policy.proto",
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
   ]
 }