Remove dead code for system VK.

ui/keyboard/resources/elements/kb-modifier-key.js

-// 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.
-
-(function () {
-
-  /**
-   * The possible states of the key.
-   * @const
-   * @type {Enum}
-   */
-  var KEY_STATES = {
-    PRESSED: "pressed", // Key-down.
-    UNLOCKED: "unlocked", // Default state.
-    TAPPED: "tapped", // Key-down followed by key-up.
-    CHORDING: "chording", // Chording mode.
-  };
-
-  /**
-   * A map of the state of all modifier keys.
-   * @type {Object}
-   */
-  var states = {};
-
-  Polymer('kb-modifier-key', {
-    up: function(event) {
-      if (this.state == KEY_STATES.PRESSED)
-        this.state = KEY_STATES.TAPPED;
-      else
-        this.state = KEY_STATES.UNLOCKED;
-      this.super([event]);
-    },
-
-    down: function(event) {
-      // First transition state so that populateDetails generates
-      // correct data.
-      switch (this.state) {
-        case KEY_STATES.UNLOCKED:
-          this.state = KEY_STATES.PRESSED;
-          break;
-        case KEY_STATES.TAPPED:
-          this.state = KEY_STATES.UNLOCKED;
-          break;
-        case KEY_STATES.PRESSED:
-        case KEY_STATES.CHORDING:
-          // We pressed another key at the same time,
-          // so ignore second press.
-          return;
-        default:
-          console.error("Undefined key state: " + state);
-          break;
-      }
-      this.super([event]);
-    },
-
-    /**
-     * Returns whether the modifier for this key is active.
-     * @return {boolean}
-     */
-    isActive: function() {
-      return this.state != KEY_STATES.UNLOCKED;
-    },
-
-    /**
-     * Notifies key that a non-control keyed down.
-     * A control key is defined as one of shift, control or alt.
-     */
-    onNonControlKeyDown: function() {
-      switch(this.state) {
-        case (KEY_STATES.PRESSED):
-          this.state = KEY_STATES.CHORDING;
-          break;
-      }
-    },
-
-    /**
-     * Notifies key that a non-control keyed was typed.
-     * A control key is defined as one of shift, control or alt.
-     */
-    onNonControlKeyTyped: function() {
-       switch(this.state) {
-         case (KEY_STATES.TAPPED):
-           this.state = KEY_STATES.UNLOCKED;
-           break;
-       }
-    },
-
-    /**
-     * Called on a pointer-out event. Ends chording.
-     * @param {event} event The pointer-out event.
-     */
-    out: function(event) {
-      // TODO(rsadam): Add chording event so that we don't reset
-      // when shift-chording.
-      if (this.state == KEY_STATES.CHORDING) {
-        this.state = KEY_STATES.UNLOCKED;
-      }
-    },
-
-    /*
-     * Overrides the autoRelease function to enable chording.
-     */
-    autoRelease: function() {
-    },
-
-    populateDetails: function(caller) {
-      var detail = this.super([caller]);
-      if (this.state != KEY_STATES.UNLOCKED)
-        detail.activeModifier = this.charValue;
-      return detail;
-    },
-
-    /**
-     *  Resets the modifier key state.
-     */
-    reset: function() {
-      this.state = KEY_STATES.UNLOCKED;
-    },
-
-    get state() {
-      var key = this.charValue;
-      if (!key)
-        console.error("missing key for kb-modifier-key state: " + this);
-      // All keys default to the unlock state.
-      if (!(key in states))
-        states[key] = KEY_STATES.UNLOCKED;
-      return states[key];
-    },
-
-    set state(value) {
-      var key = this.charValue;
-      states[key] = value;
-    }
-  });
-})();