Remove FileError interface

third_party/WebKit/LayoutTests/http/tests/inspector/isolated-filesystem-test.js

 var initialize_IsolatedFileSystemTest = function() {
 
 InspectorFrontendHost.isolatedFileSystem = function(name)
 {
     return InspectorTest.TestFileSystem._instances[name];
 }
 
 InspectorTest.TestFileSystem = function(fileSystemPath)
 {
     this.root = new InspectorTest.TestFileSystem.Entry(this, "", true, null);
@@ skipping 124 matching lines @@
     {
         if (path.startsWith("/"))
             path = path.substring(1);
         if (!path) {
             callback(this);
             return;
         }
         var entry = this;
         for (var token of path.split("/"))
             entry = entry._childrenMap[token];
-        entry ? callback(entry) : errorCallback({ code: FileError.NOT_FOUND_ERR});
+        entry ? callback(entry) : errorCallback(new DOMException('Path not found: ' + path, 'NotFoundError'));
     },
 
     getMetadata: function(success, failure)
     {
         success({
             modificationTime: new Date(this._timestamp),
             size: this.isDirectory ? 0 : this.content.size
         });
     },
 
@@ skipping 44 matching lines @@
     truncate: function(num)
     {
         this._entry._timestamp += this._modificationTimesDelta;
         this._entry.content = this._entry.content.slice(0, num);
         if (this.onwriteend)
             this.onwriteend();
     }
 }
 
 };