Media Router: Replace drop-down-button with core-icon-button.

chrome/browser/resources/media_router/elements/drop_down_button/drop_down_button.js

Index: chrome/browser/resources/media_router/elements/drop_down_button/drop_down_button.js
diff --git a/chrome/browser/resources/media_router/elements/drop_down_button/drop_down_button.js b/chrome/browser/resources/media_router/elements/drop_down_button/drop_down_button.js
deleted file mode 100644
index 613047c46636c3b402570dbf5b7da39718c869ee..0000000000000000000000000000000000000000
--- a/chrome/browser/resources/media_router/elements/drop_down_button/drop_down_button.js
+++ /dev/null
@@ -1,23 +0,0 @@
-// Copyright 2015 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.
-
-// This Polymer element is used as a button to toggle a drop down, such as
-// the cast-mode-picker.
-Polymer('drop-down-button', {
-  /**
-   * Whether or not to use the icon indicating that the drop down is shown.
-   * @private {boolean}
-   * @default false
-   */
-  useShownIcon_: false,
-
-  /**
-   * Fires a drop-down-button-click event. This is called when |this| is
-   * clicked. Switches the value of |useShownIcon_|.
-   */
-  onButtonClick: function() {
-    this.useShownIcon_ = !this.useShownIcon_;
-    this.fire('drop-down-button-click');
-  },
-});