Revert "Make bandwidth estimator cache friendly."

This reverts commit 60d2944.

Closes #367
Reopens #324

Change-Id: I4302469a319b30f1ce502554348fd69726a50c58

lib/abr/ewma_bandwidth_estimator.js

@@ -70,14 +70,6 @@ shaka.abr.EwmaBandwidthEstimator = function() {
    * @const
    */
   this.minBytes_ = 65536;
-
-
-  /**
-   * Minimum amount of time (in ms), under which samples are discarded.
-   * @private {number}
-   * @const
-   */
-  this.minTime_ = 200;
 };
 
 
@@ -98,11 +90,7 @@ shaka.abr.EwmaBandwidthEstimator.DEFAULT_ESTIMATE = 5e5;  // 500kbps
  */
 shaka.abr.EwmaBandwidthEstimator.prototype.sample = function(
     durationMs, numBytes) {
-  // Ignore small requests.  This will protect against both caching and
-  // outliers.  Small requests in size will tend to vary a lot in the time they
-  // take, and overhead of JavaScript timings have a big effect.  Also, cached
-  // responses will always return in a small time.
-  if (numBytes < this.minBytes_ || durationMs < this.minTime_) {
+  if (numBytes < this.minBytes_) {
     return;
   }