Revert "Introduce AMP Live List Cache Busting (#25295)" (#25898)

This reverts commit 0d52ea2.

build-system/test-configs/dep-check-config.js

@@ -400,8 +400,6 @@ exports.rules = [
         'src/service/origin-experiments-impl.js',
       'extensions/amp-script/0.1/amp-script.js->' +
         'src/service/origin-experiments-impl.js',
-      'extensions/amp-live-list/0.1/live-list-manager.js->' +
-        'src/service/origin-experiments-impl.js',
       // For action macros.
       'extensions/amp-action-macro/0.1/amp-action-macro.js->' +
         'src/service/action-impl.js',

extensions/amp-live-list/0.1/live-list-manager.js

@@ -16,15 +16,10 @@
 
 import {Poller} from './poller';
 import {Services} from '../../../src/services';
-import {addParamsToUrl} from '../../../src/url';
-import {dict} from '../../../src/utils/object';
+import {addParamToUrl} from '../../../src/url';
 import {fetchDocument} from '../../../src/document-fetcher';
 import {getMode} from '../../../src/mode';
 import {getServicePromiseForDoc} from '../../../src/service';
-import {
-  installOriginExperimentsForDoc,
-  originExperimentsForDoc,
-} from '../../../src/service/origin-experiments-impl';
 import {startsWith} from '../../../src/string';
 import {toArray} from '../../../src/types';
 import {userAssert} from '../../../src/log';
@@ -82,9 +77,6 @@ export class LiveListManager {
     /** @private @const {boolean} */
     this.isTransformed_ = isDocTransformed(ampdoc.getRootNode());
 
-    /** @private {?boolean} */
-    this.enrolledInAppendRandomExperiment_ = null;
-
     // Only start polling when doc is ready and when the doc is visible.
     this.whenDocReady_().then(() => {
       // Switch out the poller interval if we can find a lower one and
@@ -155,17 +147,11 @@ export class LiveListManager {
   fetchDocument_() {
     let url = this.url_;
     if (this.latestUpdateTime_ > 0) {
-      const parameters = this.enrolledInAppendRandomExperiment_
-        ? dict({
-            'amp_latest_update_time': String(this.latestUpdateTime_),
-            // AMP Caches do not always evict entries from their caches.
-            // This experiment adds a random identifier to reduce cache hits for enrolled documents.
-            'amp_random': String(Math.random()),
-          })
-        : dict({
-            'amp_latest_update_time': String(this.latestUpdateTime_),
-          });
-      url = addParamsToUrl(url, parameters);
+      url = addParamToUrl(
+        url,
+        'amp_latest_update_time',
+        String(this.latestUpdateTime_)
+      );
     }
 
     if (this.isTransformed_) {
@@ -293,17 +279,6 @@ export class LiveListManager {
     // Polling may not be started yet if no live lists were registered by
     // doc ready in LiveListManager's constructor.
     if (liveList.isEnabled() && this.poller_ && this.ampdoc.isVisible()) {
-      if (this.enrolledInAppendRandomExperiment_ === null) {
-        // Origin Trial for cache busting requests for `amp-live-list`.
-        installOriginExperimentsForDoc(this.ampdoc);
-        originExperimentsForDoc(liveList.element)
-          .getExperiments()
-          .then(
-            trials =>
-              (this.enrolledInAppendRandomExperiment_ =
-                trials && trials.includes('amp-live-list-random'))
-          );
-      }
       this.poller_.start();
     }
   }