Remove unused V8 integration code in Sky

sky/engine/bindings/core/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("//sky/engine/bindings/core/core.gni")
-import("//sky/engine/bindings/core/idl.gni")
-import("//sky/engine/bindings/scripts/scripts.gni")
-
-visibility = [ "//sky/*" ]
-
-compute_interfaces_info_individual("interfaces_info_individual_core") {
-  sources_static = core_static_idl_files
-  sources_generated = core_generated_idl_files
-  component_dir = "core"
-  output_file = "$bindings_core_output_dir/InterfacesInfoCoreIndividual.pickle"
-}