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diff --git a/contexts/data/lib/closure-library/closure/goog/labs/observe/observer.js b/contexts/data/lib/closure-library/closure/goog/labs/observe/observer.js
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--- a/contexts/data/lib/closure-library/closure/goog/labs/observe/observer.js
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@@ -1,100 +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 Provide definition of an observer. This is meant to
- * be used with {@code goog.labs.observe.Observable}.
- *
- * This file also provides convenient functions to compare and create
- * Observer objects.
- *
- */
-
-goog.provide('goog.labs.observe.Observer');
-
-
-
-/**
- * A class implementing {@code Observer} may be informed of changes in
- * observable object.
- * @see {goog.labs.observe.Observable}
- * @interface
- */
-goog.labs.observe.Observer = function() {};
-
-
-/**
- * Notifies the observer of changes to the observable object.
- * @param {!goog.labs.observe.Notice} notice The notice object.
- */
-goog.labs.observe.Observer.prototype.notify;
-
-
-/**
- * Whether this observer is equal to the given observer.
- * @param {!goog.labs.observe.Observer} observer The observer to compare with.
- * @return {boolean} Whether the two observers are equal.
- */
-goog.labs.observe.Observer.prototype.equals;
-
-
-/**
- * @param {!goog.labs.observe.Observer} observer1 Observer to compare.
- * @param {!goog.labs.observe.Observer} observer2 Observer to compare.
- * @return {boolean} Whether observer1 and observer2 are equal, as
- * determined by the first observer1's {@code equals} method.
- */
-goog.labs.observe.Observer.equals = function(observer1, observer2) {
- return observer1 == observer2 || observer1.equals(observer2);
-};
-
-
-/**
- * Creates an observer that calls the given function.
- * @param {function(!goog.labs.observe.Notice)} fn Function to be converted.
- * @param {!Object=} opt_scope Optional scope to execute the function.
- * @return {!goog.labs.observe.Observer} An observer object.
- */
-goog.labs.observe.Observer.fromFunction = function(fn, opt_scope) {
- return new goog.labs.observe.Observer.FunctionObserver_(fn, opt_scope);
-};
-
-
-
-/**
- * An observer that calls the given function on {@code notify}.
- * @param {function(!goog.labs.observe.Notice)} fn Function to delegate to.
- * @param {!Object=} opt_scope Optional scope to execute the function.
- * @constructor
- * @implements {goog.labs.observe.Observer}
- * @private
- */
-goog.labs.observe.Observer.FunctionObserver_ = function(fn, opt_scope) {
- this.fn_ = fn;
- this.scope_ = opt_scope;
-};
-
-
-/** @override */
-goog.labs.observe.Observer.FunctionObserver_.prototype.notify = function(
- notice) {
- this.fn_.call(this.scope_, notice);
-};
-
-
-/** @override */
-goog.labs.observe.Observer.FunctionObserver_.prototype.equals = function(
- observer) {
- return this.fn_ === observer.fn_ && this.scope_ === observer.scope_;
-};