[DevTools] Split auto-attach part of TargetHandler into a separate class

content/browser/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/buildflag_header.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//gpu/vulkan/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
@@ skipping 542 matching lines @@
     "devtools/protocol/schema_handler.cc",
     "devtools/protocol/schema_handler.h",
     "devtools/protocol/security_handler.cc",
     "devtools/protocol/security_handler.h",
     "devtools/protocol/service_worker_handler.cc",
     "devtools/protocol/service_worker_handler.h",
     "devtools/protocol/storage_handler.cc",
     "devtools/protocol/storage_handler.h",
     "devtools/protocol/system_info_handler.cc",
     "devtools/protocol/system_info_handler.h",
+    "devtools/protocol/target_auto_attacher.cc",
+    "devtools/protocol/target_auto_attacher.h",
     "devtools/protocol/target_handler.cc",
     "devtools/protocol/target_handler.h",
     "devtools/protocol/tethering_handler.cc",
     "devtools/protocol/tethering_handler.h",
     "devtools/protocol/tracing_handler.cc",
     "devtools/protocol/tracing_handler.h",
     "devtools/protocol_string.cc",
     "devtools/protocol_string.h",
     "devtools/render_frame_devtools_agent_host.cc",
     "devtools/render_frame_devtools_agent_host.h",
@@ skipping 1603 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }