Reorganize Blink IDL build, delete obsolete GYP files.

third_party/WebKit/Source/bindings/modules/modules.gni

-# 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.
-
-# FIXME: factor out bindings_core http://crbug.com/358074
-import("//third_party/WebKit/Source/bindings/bindings.gni")
-import("//third_party/WebKit/Source/modules/modules.gni")
-
-bindings_modules_output_dir = "$bindings_output_dir/modules"
-
-modules_core_global_constructors_original_interfaces = [
-  "CompositorWorkerGlobalScope",
-  "PaintWorkletGlobalScope",
-  "ServiceWorkerGlobalScope",
-]
-
-modules_global_constructors_original_interfaces = [
-  "Window",
-  "CompositorWorkerGlobalScope",
-  "DedicatedWorkerGlobalScope",
-  "PaintWorkletGlobalScope",
-  "ServiceWorkerGlobalScope",
-  "SharedWorkerGlobalScope",
-]
-
-modules_core_global_constructors_generated_idl_files = []
-foreach(interface, modules_core_global_constructors_original_interfaces) {
-  modules_core_global_constructors_generated_idl_files +=
-      [ "$blink_modules_output_dir/${interface}CoreConstructors.idl" ]
-}
-
-modules_global_constructors_generated_idl_files = []
-foreach(interface, modules_global_constructors_original_interfaces) {
-  modules_global_constructors_generated_idl_files +=
-      [ "$blink_modules_output_dir/${interface}ModulesConstructors.idl" ]
-}