[api-minor] Remove the, now unused, pdfjsLibPromise global

This global was only introduced to work-around problems caused by the GENERIC PDF.js build using top level await. Since that was removed in the previous commit, this global is now dead code.

Author: Snuffleupagus

gulpfile.mjs

@@ -445,10 +445,8 @@ function checkChromePreferencesFile(chromePrefsPath, webPrefs) {
 
 function tweakWebpackOutput(jsName) {
   const replacer = [
-    " __webpack_exports__ = {};",
-    ",__webpack_exports__={};",
-    " __webpack_exports__ = await __webpack_exports__;",
-    "\\(__webpack_exports__=await __webpack_exports__\\)",
+    " __webpack_exports__ = {};", // Normal builds.
+    ",__webpack_exports__={};", // Minified builds.
   ];
   const regex = new RegExp(`(${replacer.join("|")})`, "gm");
 
@@ -458,10 +456,6 @@ function tweakWebpackOutput(jsName) {
         return ` __webpack_exports__ = globalThis.${jsName} = {};`;
       case ",__webpack_exports__={};":
         return `,__webpack_exports__=globalThis.${jsName}={};`;
-      case " __webpack_exports__ = await __webpack_exports__;":
-        return ` __webpack_exports__ = globalThis.${jsName} = await (globalThis.${jsName}Promise = __webpack_exports__);`;
-      case "(__webpack_exports__=await __webpack_exports__)":
-        return `(__webpack_exports__=globalThis.${jsName}=await (globalThis.${jsName}Promise=__webpack_exports__))`;
     }
     return match;
   });

web/pdfjs.js

@@ -13,15 +13,6 @@
  * limitations under the License.
  */
 
-// Ensure that the viewer waits for the library to complete loading,
-// to avoid breaking e.g. the standalone viewer components (see issue 17228).
-if (
-  (typeof PDFJSDev === "undefined" || PDFJSDev.test("GENERIC")) &&
-  !globalThis.pdfjsLib
-) {
-  await globalThis.pdfjsLibPromise;
-}
-
 const {
   AbortException,
   AnnotationEditorLayer,