Update bindings gn files for binding modularization.

Source/bindings/core/core.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/core/core.gni")
 
 bindings_core_output_dir = "$bindings_output_dir/core"
+
+# Global constructors
+core_global_constructors_original_interfaces = [
+  "Window",
+  "SharedWorkerGlobalScope",
+  "DedicatedWorkerGlobalScope",
+]
+
+core_global_constructors_generated_idl_files = []
+foreach (interface, core_global_constructors_original_interfaces) {
+  core_global_constructors_generated_idl_files += [
+    "$blink_core_output_dir/${interface}CoreConstructors.idl"
+  ]
+}