DevTools: move FileSystemMapping under persistence/ module

third_party/WebKit/Source/devtools/front_end/persistence/Automapping.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.
+
 /**
+ * @implements {Persistence.MappingSystem}
  * @unrestricted
  */
 Persistence.Automapping = class {
   /**
    * @param {!Workspace.Workspace} workspace
    * @param {function(!Persistence.PersistenceBinding)} onBindingCreated
    * @param {function(!Persistence.PersistenceBinding)} onBindingRemoved
    */
   constructor(workspace, onBindingCreated, onBindingRemoved) {
     this._workspace = workspace;
@@ skipping 278 matching lines @@
       if (!fileMetadata)
         return false;
       // Allow a second of difference due to network timestamps lack of precision.
       var timeMatches = !networkMetadata.modificationTime ||
           Math.abs(networkMetadata.modificationTime - fileMetadata.modificationTime) < 1000;
       var contentMatches = !networkMetadata.contentSize || fileMetadata.contentSize === networkMetadata.contentSize;
       return timeMatches && contentMatches;
     });
   }
 
+  /**
+   * @override
+   */
   dispose() {
     if (this._disposed)
       return;
     this._disposed = true;
     Common.EventTarget.removeEventListeners(this._eventListeners);
     for (var binding of this._bindings.valuesArray())
       this._unbindNetwork(binding.network);
   }
 };
 
@@ skipping 120 matching lines @@
   /**
    * @param {string} path
    * @return {string}
    */
   closestParentFolder(path) {
     var encodedPath = this._encoder.encode(path);
     var commonPrefix = this._index.longestPrefix(encodedPath, true);
     return this._encoder.decode(commonPrefix);
   }
 };