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diff --git a/chromium/third_party/catapult/third_party/polymer2/bower_components/iron-checked-element-behavior/iron-checked-element-behavior.d.ts b/chromium/third_party/catapult/third_party/polymer2/bower_components/iron-checked-element-behavior/iron-checked-element-behavior.d.ts
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index 00000000000..56f12e1736d
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+++ b/chromium/third_party/catapult/third_party/polymer2/bower_components/iron-checked-element-behavior/iron-checked-element-behavior.d.ts
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+/**
+ * DO NOT EDIT
+ *
+ * This file was automatically generated by
+ *   https://github.com/Polymer/gen-typescript-declarations
+ *
+ * To modify these typings, edit the source file(s):
+ *   iron-checked-element-behavior.html
+ */
+
+/// <reference path="../polymer/types/polymer.d.ts" />
+/// <reference path="../iron-validatable-behavior/iron-validatable-behavior.d.ts" />
+/// <reference path="../iron-form-element-behavior/iron-form-element-behavior.d.ts" />
+
+declare namespace Polymer {
+
+  /**
+   * Use `Polymer.IronCheckedElementBehavior` to implement a custom element
+   * that has a `checked` property, which can be used for validation if the
+   * element is also `required`. Element instances implementing this behavior
+   * will also be registered for use in an `iron-form` element.
+   */
+  interface IronCheckedElementBehavior extends Polymer.IronFormElementBehavior, Polymer.IronValidatableBehavior {
+
+    /**
+     * Overriden from Polymer.IronFormElementBehavior
+     */
+    value: string|null|undefined;
+
+    /**
+     * Gets or sets the state, `true` is checked and `false` is unchecked.
+     */
+    checked: boolean|null|undefined;
+
+    /**
+     * If true, the button toggles the active state with each tap or press
+     * of the spacebar.
+     */
+    toggles: boolean|null|undefined;
+
+    /**
+     * Returns false if the element is required and not checked, and true
+     * otherwise.
+     *
+     * @param _value Ignored.
+     * @returns true if `required` is false or if `checked` is true.
+     */
+    _getValidity(_value?: any): boolean;
+    created(): void;
+
+    /**
+     * Update the aria-required label when `required` is changed.
+     */
+    _requiredChanged(): void;
+
+    /**
+     * Fire `iron-changed` when the checked state changes.
+     */
+    _checkedChanged(): void;
+
+    /**
+     * Reset value to 'on' if it is set to `undefined`.
+     */
+    _valueChanged(): void;
+  }
+
+  const IronCheckedElementBehavior: object;
+}