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diff --git a/contexts/data/lib/closure-library/closure/goog/math/exponentialbackoff.js b/contexts/data/lib/closure-library/closure/goog/math/exponentialbackoff.js
deleted file mode 100644
index 1b71489..0000000
--- a/contexts/data/lib/closure-library/closure/goog/math/exponentialbackoff.js
+++ /dev/null
@@ -1,103 +0,0 @@
-// Copyright 2011 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 Utility class to manage the mathematics behind computing an
- * exponential backoff model.  Given an initial backoff value and a maximum
- * backoff value, every call to backoff() will double the value until maximum
- * backoff value is reached.
- *
- */
-
-
-goog.provide('goog.math.ExponentialBackoff');
-
-goog.require('goog.asserts');
-
-
-
-/**
- * @constructor
- *
- * @param {number} initialValue The initial backoff value.
- * @param {number} maxValue The maximum backoff value.
- */
-goog.math.ExponentialBackoff = function(initialValue, maxValue) {
-  goog.asserts.assert(initialValue > 0,
-      'Initial value must be greater than zero.');
-  goog.asserts.assert(maxValue >= initialValue,
-      'Max value should be at least as large as initial value.');
-
-  /**
-   * @type {number}
-   * @private
-   */
-  this.initialValue_ = initialValue;
-
-  /**
-   * @type {number}
-   * @private
-   */
-  this.maxValue_ = maxValue;
-
-  /**
-   * The current backoff value.
-   * @type {number}
-   * @private
-   */
-  this.currValue_ = initialValue;
-};
-
-
-/**
- * The number of backoffs that have happened.
- * @type {number}
- * @private
- */
-goog.math.ExponentialBackoff.prototype.currCount_ = 0;
-
-
-/**
- * Resets the backoff value to its initial value.
- */
-goog.math.ExponentialBackoff.prototype.reset = function() {
-  this.currValue_ = this.initialValue_;
-  this.currCount_ = 0;
-};
-
-
-/**
- * @return {number} The current backoff value.
- */
-goog.math.ExponentialBackoff.prototype.getValue = function() {
-  return this.currValue_;
-};
-
-
-/**
- * @return {number} The number of times this class has backed off.
- */
-goog.math.ExponentialBackoff.prototype.getBackoffCount = function() {
-  return this.currCount_;
-};
-
-
-/**
- * Initiates a backoff.
- */
-goog.math.ExponentialBackoff.prototype.backoff = function() {
-  this.currValue_ = Math.min(this.maxValue_, this.currValue_ * 2);
-  this.currCount_++;
-};