Remove libjpeg and libjpeg_turbo.

third_party/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/android/config.gni")
-}
-
-declare_args() {
-  # Uses system libjpeg. If true, overrides use_libjpeg_turbo.
-  use_system_libjpeg = false
-
-  # Uses libjpeg_turbo as the jpeg implementation. Has no effect if
-  # use_system_libjpeg is set.
-  use_libjpeg_turbo = true
-}
-
-config("system_libjpeg_config") {
-  defines = [ "USE_SYSTEM_LIBJPEG" ]
-}
-
-config("libjpeg_turbo_config") {
-  defines = [ "USE_LIBJPEG_TURBO" ]
-}
-
-# This is a meta target that forwards to the system's libjpeg,
-# third_party/libjpeg, or third_party/libjpeg_turbo depending on the build args
-# declared in this file.
-group("jpeg") {
-  if (use_system_libjpeg) {
-    libs = [ "jpeg" ]
-    public_configs = [ ":system_libjpeg_config" ]
-  } else if (use_libjpeg_turbo) {
-    deps = [
-      "//third_party/libjpeg_turbo:libjpeg",
-    ]
-    public_configs = [ ":libjpeg_turbo_config" ]
-  } else {
-    deps = [
-      "//third_party/libjpeg:libjpeg",
-    ]
-  }
-}