Polymer: Remove unused paper-dropdown-menu, paper-menu-button.

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

-# 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-menu-button-animations-extracted',
-      'dependencies': [
-        '../neon-animation/compiled_resources2.gyp:neon-animation-behavior-extracted',
-        '<(EXTERNS_GYP):web_animations',
-      ],
-      'includes': ['../../../../closure_compiler/compile_js2.gypi'],
-    },
-    {
-      'target_name': 'paper-menu-button-extracted',
-      'dependencies': [
-        '../iron-a11y-keys-behavior/compiled_resources2.gyp:iron-a11y-keys-behavior-extracted',
-        '../iron-behaviors/compiled_resources2.gyp:iron-control-state-extracted',
-        '../iron-dropdown/compiled_resources2.gyp:iron-dropdown-extracted',
-        '../neon-animation/animations/compiled_resources2.gyp:fade-in-animation-extracted',
-        '../neon-animation/animations/compiled_resources2.gyp:fade-out-animation-extracted',
-        'paper-menu-button-animations-extracted',
-      ],
-      'includes': ['../../../../closure_compiler/compile_js2.gypi'],
-    },
-  ],
-}