Bug 1644357 - Remove unused WebExtensionDescriptor properties isAPIExtension & type r=daisuke

Depends on D78009

Differential Revision: https://phabricator.services.mozilla.com/D78868

devtools/client/fronts/descriptors/webextension.js

@@ -54,11 +54,6 @@ class WebExtensionDescriptorFront extends FrontClassWithSpec(
     return this._form.id;
   }
 
-  // Currently unused on the client.
-  get isAPIExtension() {
-    return this._form.isAPIExtension;
-  }
-
   get isSystem() {
     return this._form.isSystem;
   }
@@ -79,11 +74,6 @@ class WebExtensionDescriptorFront extends FrontClassWithSpec(
     return this._form.temporarilyInstalled;
   }
 
-  // Currently unused on the client.
-  get type() {
-    return this._form.type;
-  }
-
   get url() {
     return this._form.url;
   }

devtools/server/actors/descriptors/webextension.js

@@ -77,14 +77,12 @@ const WebExtensionDescriptorActor = protocol.ActorClassWithSpec(
         iconDataURL: this._iconDataURL,
         iconURL: this.addon.iconURL,
         id: this.addonId,
-        isAPIExtension: this.addon.isAPIExtension,
         isSystem: this.addon.isSystem,
         isWebExtension: this.addon.isWebExtension,
         manifestURL: policy && policy.getURL("manifest.json"),
         name: this.addon.name,
         temporarilyInstalled: this.addon.temporarilyInstalled,
         traits: {},
-        type: this.addon.type,
         url: this.addon.sourceURI ? this.addon.sourceURI.spec : undefined,
         warnings: ExtensionParent.DebugUtils.getExtensionManifestWarnings(
           this.addonId