Update iron-overlay-behavior to version 1.10.2.

third_party/polymer/v1_0/components-chromium/paper-dropdown-menu/compiled_resources2.gyp

-# Copyright 2016 The Chromium Authors. All rights reserved.
+# Copyright 2017 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.
 #
 # NOTE: Created with generate_compiled_resources_gyp.py, please do not edit.
 {
   'targets': [
     {
       'target_name': 'paper-dropdown-menu-extracted',
       'dependencies': [
         '../iron-a11y-keys-behavior/compiled_resources2.gyp:iron-a11y-keys-behavior-extracted',
@@ skipping 27 matching lines @@
         '../paper-menu-button/compiled_resources2.gyp:paper-menu-button-extracted',
       ],
       'includes': ['../../../../closure_compiler/compile_js2.gypi'],
     },
     {
       'target_name': 'paper-dropdown-menu-shared-styles-extracted',
       'includes': ['../../../../closure_compiler/compile_js2.gypi'],
     },
   ],
 }