[api-minor] Remove the xfaLayerFactory in the viewer

Please note that this functionality has never really mattered for the Firefox PDF Viewer, the GENERIC viewer, or even the "simpleviewer"/"singlepageviewer" component-examples. Hence, in practice this means that only the "pageviewer" component-example[1] have ever really utilized this.

Using factories to initialize various layers in the viewer, rather than simply invoking the relevant code directly, seems (at least to me) like a somewhat roundabout way of doing things.
Not only does this lead to more code, both to write and maintain, but since many of the layers have common parameters (e.g. an `AnnotationStorage`-instance) there's also some duplication.

Hence this patch, which removes the `xfaLayerFactory` and instead uses a lookup-function in the `PDFPageView`-class to access the external viewer-properties as necessary.
Note that this should even be an improvement for the "pageviewer" component-example, since most layers will now work by default rather than require manual configuration.

---
[1] In practice we generally suggest using the "simpleviewer", or "singlepageviewer", since it does *most* things out-of-the-box and given that a lot of functionality really require *a viewer* and not just a single page in order to work.

web/pdf_viewer.js

@@ -23,7 +23,6 @@
 /** @typedef {import("./interfaces").IDownloadManager} IDownloadManager */
 /** @typedef {import("./interfaces").IL10n} IL10n */
 /** @typedef {import("./interfaces").IPDFLinkService} IPDFLinkService */
-/** @typedef {import("./interfaces").IPDFXfaLayerFactory} IPDFXfaLayerFactory */
 
 import {
   AnnotationEditorType,
@@ -63,7 +62,6 @@ import { NullL10n } from "./l10n_utils.js";
 import { PDFPageView } from "./pdf_page_view.js";
 import { PDFRenderingQueue } from "./pdf_rendering_queue.js";
 import { SimpleLinkService } from "./pdf_link_service.js";
-import { XfaLayerBuilder } from "./xfa_layer_builder.js";
 
 const DEFAULT_CACHE_SIZE = 10;
 const ENABLE_PERMISSIONS_CLASS = "enablePermissions";
@@ -196,8 +194,6 @@ class PDFPageViewBuffer {
 
 /**
  * Simple viewer control to display PDF content/pages.
- *
- * @implements {IPDFXfaLayerFactory}
  */
 class PDFViewer {
   #buffer = null;
@@ -780,7 +776,6 @@ class PDFViewer {
             renderingQueue: this.renderingQueue,
             textLayerMode,
             annotationMode,
-            xfaLayerFactory: this,
             imageResourcesPath: this.imageResourcesPath,
             renderer:
               typeof PDFJSDev === "undefined" ||
@@ -1654,31 +1649,6 @@ class PDFViewer {
     return false;
   }
 
-  /**
-   * @typedef {Object} CreateXfaLayerBuilderParameters
-   * @property {HTMLDivElement} pageDiv
-   * @property {PDFPageProxy} pdfPage
-   * @property {AnnotationStorage} [annotationStorage] - Storage for annotation
-   *   data in forms.
-   */
-
-  /**
-   * @param {CreateXfaLayerBuilderParameters}
-   * @returns {XfaLayerBuilder}
-   */
-  createXfaLayerBuilder({
-    pageDiv,
-    pdfPage,
-    annotationStorage = this.pdfDocument?.annotationStorage,
-  }) {
-    return new XfaLayerBuilder({
-      pageDiv,
-      pdfPage,
-      annotationStorage,
-      linkService: this.linkService,
-    });
-  }
-
   /**
    * @type {boolean} Whether all pages of the PDF document have identical
    *   widths and heights.