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diff --git a/contexts/data/lib/closure-library/closure/goog/labs/observe/observationset.js b/contexts/data/lib/closure-library/closure/goog/labs/observe/observationset.js
deleted file mode 100644
index 892c3c6..0000000
--- a/contexts/data/lib/closure-library/closure/goog/labs/observe/observationset.js
+++ /dev/null
@@ -1,156 +0,0 @@
-// Copyright 2012 The Closure Library Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS-IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-/**
- * @fileoverview A set of observations. This set provides a convenient
- * means of observing many observables at once.
- *
- * This is similar in purpose to {@code goog.events.EventHandler}.
- *
- */
-
-goog.provide('goog.labs.observe.ObservationSet');
-
-goog.require('goog.array');
-goog.require('goog.labs.observe.Observer');
-
-
-
-/**
- * A set of observations. An observation is defined by an observable
- * and an observer. The set keeps track of observations and
- * allows their removal.
- * @param {!Object=} opt_defaultScope Optional function scope to use
- *     when using {@code observeWithFunction} and
- *     {@code unobserveWithFunction}.
- * @constructor
- */
-goog.labs.observe.ObservationSet = function(opt_defaultScope) {
-  /**
-   * @type {!Array.<!goog.labs.observe.ObservationSet.Observation_>}
-   * @private
-   */
-  this.storedObservations_ = [];
-
-  /**
-   * @type {!Object|undefined}
-   * @private
-   */
-  this.defaultScope_ = opt_defaultScope;
-};
-
-
-/**
- * Observes the given observer on the observable.
- * @param {!goog.labs.observe.Observable} observable The observable to
- *     observe on.
- * @param {!goog.labs.observe.Observer} observer The observer.
- * @return {boolean} True if the observer is successfully registered.
- */
-goog.labs.observe.ObservationSet.prototype.observe = function(
-    observable, observer) {
-  var success = observable.observe(observer);
-  if (success) {
-    this.storedObservations_.push(
-        new goog.labs.observe.ObservationSet.Observation_(
-            observable, observer));
-  }
-  return success;
-};
-
-
-/**
- * Observes the given function on the observable.
- * @param {!goog.labs.observe.Observable} observable The observable to
- *     observe on.
- * @param {function(!goog.labs.observe.Notice)} fn The handler function.
- * @param {!Object=} opt_scope Optional scope.
- * @return {goog.labs.observe.Observer} The registered observer object.
- *     If the observer is not successfully registered, this will be null.
- */
-goog.labs.observe.ObservationSet.prototype.observeWithFunction = function(
-    observable, fn, opt_scope) {
-  var observer = goog.labs.observe.Observer.fromFunction(
-      fn, opt_scope || this.defaultScope_);
-  if (this.observe(observable, observer)) {
-    return observer;
-  }
-  return null;
-};
-
-
-/**
- * Unobserves the given observer from the observable.
- * @param {!goog.labs.observe.Observable} observable The observable to
- *     unobserve from.
- * @param {!goog.labs.observe.Observer} observer The observer.
- * @return {boolean} True if the observer is successfully removed.
- */
-goog.labs.observe.ObservationSet.prototype.unobserve = function(
-    observable, observer) {
-  var removed = goog.array.removeIf(
-      this.storedObservations_, function(o) {
-        return o.observable == observable &&
-            goog.labs.observe.Observer.equals(o.observer, observer);
-      });
-
-  if (removed) {
-    observable.unobserve(observer);
-  }
-  return removed;
-};
-
-
-/**
- * Unobserves the given function from the observable.
- * @param {!goog.labs.observe.Observable} observable The observable to
- *     unobserve from.
- * @param {function(!goog.labs.observe.Notice)} fn The handler function.
- * @param {!Object=} opt_scope Optional scope.
- * @return {boolean} True if the observer is successfully removed.
- */
-goog.labs.observe.ObservationSet.prototype.unobserveWithFunction = function(
-    observable, fn, opt_scope) {
-  var observer = goog.labs.observe.Observer.fromFunction(
-      fn, opt_scope || this.defaultScope_);
-  return this.unobserve(observable, observer);
-};
-
-
-/**
- * Removes all observations registered through this set.
- */
-goog.labs.observe.ObservationSet.prototype.removeAll = function() {
-  goog.array.forEach(this.storedObservations_, function(observation) {
-    var observable = observation.observable;
-    var observer = observation.observer;
-    observable.unobserve(observer);
-  });
-};
-
-
-
-/**
- * A representation of an observation, which is defined uniquely by
- * the observable and observer.
- * @param {!goog.labs.observe.Observable} observable The observable.
- * @param {!goog.labs.observe.Observer} observer The observer.
- * @constructor
- * @private
- */
-goog.labs.observe.ObservationSet.Observation_ = function(
-    observable, observer) {
-  this.observable = observable;
-  this.observer = observer;
-};