Remove third_party/polymer from .gitignore

third_party/polymer/v1_0/components/more-routing/driver.html

-<!--
-Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
-This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
-The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
-The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
-Code distributed by Google as part of the polymer project is also
-subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
--->
-<script>
-(function(scope) {
-var MoreRouting = scope.MoreRouting = scope.MoreRouting || {};
-MoreRouting.Driver = Driver;
-
-/**
- * TODO(nevir): Docs.
- */
-function Driver(opt_config) {
-  var config = opt_config || {};
-  if (config.prefix) this.prefix = config.prefix;
-
-  this._activeRoutes = [];
-
-  this._rootRoutes = [];
-}
-
-Driver.prototype.manageRoute = function manageRoute(route) {
-  route.driver = this;
-  this._appendRoute(route);
-
-  if (route.parent) {
-    if (route.parent.active) {
-      // Remember: `processPathParts` takes just the path parts relative to that
-      // route; not the full set.
-      route.processPathParts(this.currentPathParts.slice(route.parent.depth));
-    }
-  } else {
-    route.processPathParts(this.currentPathParts);
-  }
-
-  if (route.active) this._activeRoutes.push(route);
-};
-
-Driver.prototype.urlForParts = function urlForParts(parts) {
-  return this.prefix + parts.join(this.separator);
-};
-
-Driver.prototype.navigateToParts = function(parts) {
-  return this.navigateToUrl(this.urlForParts(parts));
-};
-
-Driver.prototype.navigateToUrl = function navigateToUrl(url) {
-  throw new Error(this.constructor.name + '#navigateToUrl not implemented');
-};
-
-// Subclass Interface
-
-Driver.prototype.prefix = '/';
-Driver.prototype.separator = '/';
-
-Driver.prototype.setCurrentPath = function setCurrentPath(path) {
-  this.currentPathParts = this.splitPath(path);
-  var newRoutes = this._matchingRoutes(this.currentPathParts);
-
-  // active -> inactive.
-  for (var i = 0, route; route = this._activeRoutes[i]; i++) {
-    if (newRoutes.indexOf(route) === -1) {
-      route.processPathParts(null);
-    }
-  }
-
-  this._activeRoutes = newRoutes;
-}
-
-Driver.prototype.splitPath = function splitPath(rawPath) {
-  if (this.prefix && rawPath.indexOf(this.prefix) !== 0) {
-    throw new Error(
-        'Invalid path "' + rawPath + '"; ' +
-        'expected it to be prefixed by "' + this.prefix + '"');
-  }
-  var path  = rawPath.substr(this.prefix.length);
-  var parts = path.split(this.separator);
-  // Ignore trailing separators.
-  if (!parts[parts.length - 1]) parts.pop();
-
-  return parts;
-};
-
-// Internal Implementation
-Driver.prototype._appendRoute = function _appendRoute(route) {
-  if (route.parent) {
-    // We only care about root routes.
-    return;
-  }
-  this._rootRoutes.push(route);
-};
-
-Driver.prototype._matchingRoutes = function _matchingRoutes(parts, rootRoutes) {
-  var routes = [];
-  var candidates = rootRoutes || this._rootRoutes;
-  var route;
-  for (var i = 0; i < candidates.length; i++) {
-    route = candidates[i];
-    route.processPathParts(parts);
-    if (route.active) {
-      routes.push(route);
-      routes = routes.concat(this._matchingRoutes(parts.slice(route.compiled.length), route.children));
-    }
-  }
-  return routes;
-}
-
-})(window);
-</script>