Bug 1680218 - [devtools] Remove supportsIsTopLevelDocument trait. r=rcaliman.

The trait was introduced in Firefox 81, so it's
safe to remove it now.

Differential Revision: https://phabricator.services.mozilla.com/D98489

devtools/client/fronts/node.js

@@ -321,12 +321,6 @@ class NodeFront extends FrontClassWithSpec(nodeSpec) {
     return this._form.isTopLevelDocument;
   }
 
-  // @backward-compat { version 81 } On newer server, this is never called; `isTopLevelDocument`
-  // is returned from the server.
-  set isTopLevelDocument(isTopLevelDocument) {
-    this._form.isTopLevelDocument = isTopLevelDocument;
-  }
-
   get isShadowRoot() {
     return this._form.isShadowRoot;
   }

devtools/client/fronts/walker.js

@@ -549,14 +549,14 @@ class WalkerFront extends FrontClassWithSpec(walkerSpec) {
   }
 
   _onRootNodeAvailable(rootNode) {
-    if (this._isTopLevelRootNode(rootNode)) {
+    if (rootNode.isTopLevelDocument) {
       this.rootNode = rootNode;
       this._rootNodePromiseResolve(this.rootNode);
     }
   }
 
   _onRootNodeDestroyed(rootNode) {
-    if (this._isTopLevelRootNode(rootNode)) {
+    if (rootNode.isTopLevelDocument) {
       this._rootNodePromise = new Promise(
         r => (this._rootNodePromiseResolve = r)
       );
@@ -564,16 +564,6 @@ class WalkerFront extends FrontClassWithSpec(walkerSpec) {
     }
   }
 
-  _isTopLevelRootNode(rootNode) {
-    if (!rootNode.traits.supportsIsTopLevelDocument) {
-      // When `supportsIsTopLevelDocument` is false, a root-node resource is
-      // necessarily top level, so we can fallback to true.
-      return true;
-    }
-
-    return rootNode.isTopLevelDocument;
-  }
-
   /**
    * Start the element picker on the debuggee target.
    * @param {Boolean} doFocus - Optionally focus the content area once the picker is

devtools/server/actors/inspector/node.js

@@ -205,9 +205,7 @@ const NodeActor = protocol.ActorClassWithSpec(nodeSpec, {
         this.rawNode.ownerDocument &&
         this.rawNode.ownerDocument.contentType === "text/html",
       hasEventListeners: this._hasEventListeners,
-      traits: {
-        supportsIsTopLevelDocument: true,
-      },
+      traits: {},
     };
 
     if (this.isDocumentElement()) {

devtools/shared/resources/resource-watcher.js

@@ -898,8 +898,6 @@ const ResourceTransformers = {
     .ERROR_MESSAGE]: require("devtools/shared/resources/transformers/error-messages"),
   [ResourceWatcher.TYPES
     .LOCAL_STORAGE]: require("devtools/shared/resources/transformers/storage-local-storage.js"),
-  [ResourceWatcher.TYPES
-    .ROOT_NODE]: require("devtools/shared/resources/transformers/root-node"),
   [ResourceWatcher.TYPES
     .SESSION_STORAGE]: require("devtools/shared/resources/transformers/storage-session-storage.js"),
   [ResourceWatcher.TYPES

devtools/shared/resources/transformers/moz.build

@@ -6,7 +6,6 @@ DevToolsModules(
     "console-messages.js",
     "error-messages.js",
     "network-events.js",
-    "root-node.js",
     "storage-local-storage.js",
     "storage-session-storage.js",
 )

devtools/shared/resources/transformers/root-node.js

@@ -1,21 +0,0 @@
-/* This Source Code Form is subject to the terms of the Mozilla Public
- * License, v. 2.0. If a copy of the MPL was not distributed with this
- * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
-
-"use strict";
-
-/**
- * Transformer for the root node resource.
- *
- * @param {NodeFront} resource
- * @param {TargetFront} targetFront
- * @return {NodeFront} the updated resource
- */
-module.exports = function({ resource, targetFront }) {
-  if (!resource.traits.supportsIsTopLevelDocument) {
-    // When `supportsIsTopLevelDocument` is false, a root-node resource is
-    // necessarily top level, se we can fallback to true.
-    resource.isTopLevelDocument = true;
-  }
-  return resource;
-};