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

components/cast_channel/BUILD.gn

Index: components/cast_channel/BUILD.gn
diff --git a/components/cast_channel/BUILD.gn b/components/cast_channel/BUILD.gn
index 71f791ed1be20e2950bb92eadca09706922d0888..ef44a6e87358ea7a760ca231e2da180290d484b9 100644
--- a/components/cast_channel/BUILD.gn
+++ b/components/cast_channel/BUILD.gn
@@ -4,77 +4,10 @@
 
 static_library("cast_channel") {
   sources = [
-    "cast_auth_util.cc",
-    "cast_auth_util.h",
     "cast_channel_enum.cc",
     "cast_channel_enum.h",
-    "cast_framer.cc",
-    "cast_framer.h",
-    "cast_message_util.cc",
-    "cast_message_util.h",
-    "cast_socket.cc",
-    "cast_socket.h",
-    "cast_socket_service.cc",
-    "cast_socket_service.h",
-    "cast_socket_service_factory.cc",
-    "cast_socket_service_factory.h",
-    "cast_transport.cc",
-    "cast_transport.h",
-    "keep_alive_delegate.cc",
-    "keep_alive_delegate.h",
-    "logger.cc",
-    "logger.h",
   ]
   deps = [
     "//base",
-    "//components/cast_certificate",
-    "//components/cast_channel/proto:cast_channel_proto",
-    "//components/keyed_service/content",
-    "//components/keyed_service/core",
-    "//content/public/browser",
-    "//crypto",
-    "//net",
   ]
 }
-
-static_library("test_support") {
-  testonly = true
-  sources = [
-    "cast_test_util.cc",
-    "cast_test_util.h",
-  ]
-  deps = [
-    ":cast_channel",
-    "//base",
-    "//components/cast_channel/proto:cast_channel_proto",
-    "//net",
-    "//testing/gmock",
-    "//testing/gtest",
-  ]
-}
-
-source_set("unit_tests") {
-  testonly = true
-  sources = [
-    "cast_auth_util_unittest.cc",
-    "cast_framer_unittest.cc",
-    "cast_socket_service_unittest.cc",
-    "cast_socket_unittest.cc",
-    "cast_transport_unittest.cc",
-    "keep_alive_delegate_unittest.cc",
-    "logger_unittest.cc",
-  ]
-  deps = [
-    ":cast_channel",
-    ":test_support",
-    "//base/test:test_support",
-    "//components/cast_certificate",
-    "//components/cast_certificate:test_support",
-    "//components/cast_certificate/proto:unittest_proto",
-    "//components/cast_channel/proto:cast_channel_proto",
-    "//content/test:test_support",
-    "//net:test_support",
-    "//testing/gmock",
-    "//testing/gtest",
-  ]
-}