DevTools: revert Persistence2.0 experiment by default.

third_party/WebKit/Source/devtools/front_end/persistence/Persistence.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 /**
  * @unrestricted
  */
 Persistence.Persistence = class extends Common.Object {
   /**
    * @param {!Workspace.Workspace} workspace
    * @param {!Bindings.BreakpointManager} breakpointManager
@@ skipping 25 matching lines @@
    */
   _setMappingForTest(mappingFactory) {
     this._mapping.dispose();
     this._mapping = mappingFactory(this._validateBinding.bind(this), this._onBindingRemoved.bind(this));
   }
 
   /**
    * @param {!Persistence.PersistenceBinding} binding
    */
   _validateBinding(binding) {
-    if (!Runtime.experiments.isEnabled('persistenceValidation') || binding.network.contentType().isFromSourceMap() ||
+    if (!Runtime.experiments.isEnabled('persistence2') || binding.network.contentType().isFromSourceMap() ||
         !binding.fileSystem.contentType().isTextType()) {
       this._establishBinding(binding);
       return;
     }
 
     Promise.all([binding.network.requestContent(), binding.fileSystem.requestContent()]).then(onContents.bind(this));
 
     /**
      * @this {Persistence.Persistence}
      */
@@ skipping 328 matching lines @@
   constructor(network, fileSystem, exactMatch) {
     this.network = network;
     this.fileSystem = fileSystem;
     this.exactMatch = exactMatch;
     this._removed = false;
   }
 };
 
 /** @type {!Persistence.Persistence} */
 Persistence.persistence;