Revert of [cast_channel] Move cast_channel related files from //extensions to //components

extensions/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/config/features.gni")
 import("//extensions/features/features.gni")
 
 assert(enable_extensions)
 
 group("browser") {
@@ skipping 381 matching lines @@
     "//testing/gtest",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
   sources = [
     "api/alarms/alarms_api_unittest.cc",
     "api/api_resource_manager_unittest.cc",
     "api/bluetooth/bluetooth_event_router_unittest.cc",
+    "api/cast_channel/cast_auth_util_unittest.cc",
     "api/cast_channel/cast_channel_api_unittest.cc",
     "api/cast_channel/cast_channel_enum_util_unittest.cc",
+    "api/cast_channel/cast_framer_unittest.cc",
+    "api/cast_channel/cast_socket_service_unittest.cc",
+    "api/cast_channel/cast_socket_unittest.cc",
+    "api/cast_channel/cast_transport_unittest.cc",
+    "api/cast_channel/keep_alive_delegate_unittest.cc",
+    "api/cast_channel/logger_unittest.cc",
     "api/declarative/declarative_rule_unittest.cc",
     "api/declarative/deduping_factory_unittest.cc",
     "api/declarative/rules_registry_unittest.cc",
     "api/declarative_webrequest/webrequest_condition_attribute_unittest.cc",
     "api/declarative_webrequest/webrequest_condition_unittest.cc",
     "api/document_scan/document_scan_api_unittest.cc",
     "api/document_scan/document_scan_interface_chromeos_unittest.cc",
     "api/document_scan/mock_document_scan_interface.cc",
     "api/document_scan/mock_document_scan_interface.h",
     "api/file_handlers/app_file_handler_util_unittest.cc",
@@ skipping 99 matching lines @@
       "api/media_perception_private/media_perception_api_manager_unittest.cc",
       "api/webcam_private/visca_webcam_unittest.cc",
     ]
 
     deps += [
       "//chromeos:media_perception_proto",
       "//chromeos:test_support",
     ]
   }
 }