DevTools: remove DevToolsTargetDescriptor and its implementations, we are now based on devtools age…

chrome/browser/devtools/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.
 
 if (!is_android) {
   import("//build/config/features.gni")
   import("//tools/grit/grit_rule.gni")
 }
 
 action("devtools_protocol_constants") {
@@ skipping 100 matching lines @@
       "devtools_contents_resizing_strategy.cc",
       "devtools_contents_resizing_strategy.h",
       "devtools_embedder_message_dispatcher.cc",
       "devtools_embedder_message_dispatcher.h",
       "devtools_file_helper.cc",
       "devtools_file_helper.h",
       "devtools_file_system_indexer.cc",
       "devtools_file_system_indexer.h",
       "devtools_file_watcher.cc",
       "devtools_file_watcher.h",
-      "devtools_target_impl.cc",
-      "devtools_target_impl.h",
       "devtools_targets_ui.cc",
       "devtools_targets_ui.h",
       "devtools_toggle_action.cc",
       "devtools_toggle_action.h",
       "devtools_ui_bindings.cc",
       "devtools_ui_bindings.h",
       "devtools_window.cc",
       "devtools_window.h",
       "global_confirm_info_bar.cc",
       "global_confirm_info_bar.h",
       "remote_debugging_server.cc",
       "remote_debugging_server.h",
     ]
     if (enable_service_discovery) {
       sources += [
         "device/cast_device_provider.cc",
         "device/cast_device_provider.h",
       ]
     }
   }
 }