Remove the //rtc_base target

Bug: webrtc:9838
Change-Id: I17d2a011df20019c517ae92ff25a778070065a5b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/291185
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Florent Castelli <orphis@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39173}

rtc_base/BUILD.gn

@@ -1083,202 +1083,6 @@ if (is_win) {
   }
 }
 
-rtc_library("rtc_base") {
-  visibility = [ "*" ]
-  cflags = []
-  cflags_cc = []
-  libs = []
-  defines = []
-  deps = [
-    ":async_packet_socket",
-    ":async_resolver_interface",
-    ":async_socket",
-    ":async_tcp_socket",
-    ":async_udp_socket",
-    ":buffer",
-    ":byte_buffer",
-    ":byte_order",
-    ":callback_list",
-    ":checks",
-    ":copy_on_write_buffer",
-    ":crc32",
-    ":crypt_string",
-    ":data_rate_limiter",
-    ":dscp",
-    ":file_rotating_stream",
-    ":http_common",
-    ":ip_address",
-    ":logging",
-    ":macromagic",
-    ":mdns_responder_interface",
-    ":net_helper",
-    ":network",
-    ":network_constants",
-    ":network_route",
-    ":null_socket_server",
-    ":proxy_info",
-    ":refcount",
-    ":rtc_certificate_generator",
-    ":rtc_event",
-    ":rtc_task_queue",
-    ":safe_conversions",
-    ":socket",
-    ":socket_adapters",
-    ":socket_address",
-    ":socket_address_pair",
-    ":socket_factory",
-    ":socket_server",
-    ":ssl",
-    ":stream",
-    ":stringutils",
-    ":threading",
-    ":timeutils",
-    ":unique_id_generator",
-    ":zero_memory",
-    "../api:array_view",
-    "../api:field_trials_view",
-    "../api:function_view",
-    "../api:make_ref_counted",
-    "../api:refcountedbase",
-    "../api:scoped_refptr",
-    "../api:sequence_checker",
-    "../api/numerics",
-    "../api/task_queue",
-    "../api/task_queue:pending_task_safety_flag",
-    "../api/transport:field_trial_based_config",
-    "../api/units:time_delta",
-    "../rtc_base/experiments:field_trial_parser",
-    "../system_wrappers:field_trial",
-    "memory:always_valid_pointer",
-    "network:sent_packet",
-    "synchronization:mutex",
-    "system:file_wrapper",
-    "system:inline",
-    "system:no_unique_address",
-    "system:rtc_export",
-    "task_utils:repeating_task",
-    "third_party/base64",
-    "third_party/sigslot",
-  ]
-  absl_deps = [
-    "//third_party/abseil-cpp/absl/algorithm:container",
-    "//third_party/abseil-cpp/absl/base:core_headers",
-    "//third_party/abseil-cpp/absl/container:flat_hash_map",
-    "//third_party/abseil-cpp/absl/functional:any_invocable",
-    "//third_party/abseil-cpp/absl/memory",
-    "//third_party/abseil-cpp/absl/strings",
-    "//third_party/abseil-cpp/absl/types:optional",
-  ]
-  public_configs = []
-
-  sources = [
-    # Kept during transition
-    "async_packet_socket.h",
-    "async_tcp_socket.h",
-    "async_udp_socket.h",
-    "crc32.h",
-    "crypt_string.h",
-    "data_rate_limiter.h",
-    "dscp.h",
-    "file_rotating_stream.h",
-    "helpers.h",
-    "http_common.h",
-    "mdns_responder_interface.h",
-    "message_digest.h",
-    "net_helper.h",
-    "network.h",
-    "network_route.h",
-    "openssl.h",
-    "openssl_adapter.h",
-    "openssl_digest.h",
-    "openssl_key_pair.h",
-    "openssl_session_cache.h",
-    "openssl_stream_adapter.h",
-    "openssl_utility.h",
-    "proxy_info.h",
-    "rtc_certificate.h",
-    "rtc_certificate_generator.h",
-    "socket_adapters.h",
-    "socket_address_pair.h",
-    "ssl_adapter.h",
-    "ssl_certificate.h",
-    "ssl_fingerprint.h",
-    "ssl_identity.h",
-    "ssl_stream_adapter.h",
-    "stream.h",
-    "unique_id_generator.h",
-  ]
-
-  # If we are building the SSL library ourselves, we know it's BoringSSL.
-  if (rtc_build_ssl) {
-    sources += [
-      "boringssl_certificate.h",
-      "boringssl_identity.h",
-    ]
-  } else {
-    sources += [
-      "openssl_certificate.h",
-      "openssl_identity.h",
-    ]
-  }
-
-  if (build_with_chromium) {
-    include_dirs = [ "../../boringssl/src/include" ]
-  } else {
-    sources += [
-      "log_sinks.h",
-      "rolling_accumulator.h",
-      "ssl_roots.h",
-    ]
-
-    deps += [
-      ":log_sinks",
-      ":rolling_accumulator",
-      ":rtc_numerics",
-    ]
-
-    if (is_win) {
-      sources += [ "win32_socket_init.h" ]
-      deps += [ ":win32_socket_init" ]
-    }
-  }  # !build_with_chromium
-
-  if (rtc_build_ssl) {
-    deps += [ "//third_party/boringssl" ]
-  } else {
-    configs += [ ":external_ssl_library" ]
-  }
-
-  if (is_android) {
-    deps += [ ":ifaddrs_android" ]
-  }
-
-  if (is_linux || is_chromeos) {
-    libs += [
-      "dl",
-      "rt",
-    ]
-  }
-
-  if (is_ios) {
-    frameworks = [
-      "CFNetwork.framework",
-      "Foundation.framework",
-      "Security.framework",
-      "SystemConfiguration.framework",
-      "UIKit.framework",
-    ]
-  }
-
-  if (is_win) {
-    deps += [ ":win32" ]
-  }
-
-  if (is_posix || is_fuchsia) {
-    sources += [ "ifaddrs_converter.h" ]
-  }
-}
-
 rtc_library("ifaddrs_converter") {
   sources = []
   deps = [