[api-major] Remove the PDFDocumentProxy.prototype.destroy method

This is a left-over from very old code, which pre-dates the introduction of the `PDFDocumentLoadingTask` and it's nothing more than an alias for its `destroy` method.
Given that `PDFDocumentProxy` already provides a way to access the underlying `PDFDocumentLoadingTask` instance, it shouldn't be necessary to have an alias for one of its methods.

*Please note:* For any existing code relying on the removed method, updating it should be as simple as replacing `pdfDocument.destroy()` with `pdfDocument.loadingTask.destroy()`.

---

[1] If the `PDFDocumentProxy` class was added today, there's no chance that it'd include a `destroy` method.

src/display/api.js

@@ -1026,13 +1026,6 @@ class PDFDocumentProxy {
     return this._transport.startCleanup(keepLoadedFonts || this.isPureXfa);
   }
 
-  /**
-   * Destroys the current document instance and terminates the worker.
-   */
-  destroy() {
-    return this.loadingTask.destroy();
-  }
-
   /**
    * @param {RefProxy} ref - The page reference.
    * @returns {number | null} The page number, if it's cached.

test/driver.js

@@ -969,7 +969,7 @@ class Driver {
     // Wipe out the link to the pdfdoc so it can be GC'ed.
     for (const task of [this.currentTask, ...this.taskQueue]) {
       if (task?.pdfDoc) {
-        destroyedPromises.push(task.pdfDoc.destroy());
+        destroyedPromises.push(task.pdfDoc.loadingTask.destroy());
         delete task.pdfDoc;
       }
     }

test/unit/api_spec.js

@@ -3203,7 +3203,7 @@ describe("api", function () {
         params.url = url.href;
         loadingTask = getDocument(params);
         return loadingTask.promise
-          .then(pdf => pdf.destroy())
+          .then(() => loadingTask.destroy())
           .then(
             function () {
               expect(expectSuccess).toEqual(true);

web/internal/debugger.js

@@ -95,7 +95,7 @@ async function openDocument(source, name) {
 
   if (pdfDoc) {
     pageView.reset();
-    await pdfDoc.destroy();
+    await pdfDoc.loadingTask.destroy();
     pdfDoc = null;
   }