Bug 1842573 - Remove the unused eventBusDispatchToDOM preference from various tests. r=pdfjs-reviewers,perftest-reviewers,marco,sparky

This preference was removed over three years ago, please see the upstream patch in https://github.com/mozilla/pdf.js/pull/11655

Differential Revision: https://phabricator.services.mozilla.com/D183153

dom/security/test/csp/browser_pdfjs_not_subject_to_csp.js

@@ -6,9 +6,6 @@ const TEST_PATH = getRootDirectory(gTestPath).replace(
 );
 
 add_task(async function () {
-  await SpecialPowers.pushPrefEnv({
-    set: [["pdfjs.eventBusDispatchToDOM", true]],
-  });
   await BrowserTestUtils.withNewTab(
     TEST_PATH + "file_pdfjs_not_subject_to_csp.html",
     async function (browser) {

testing/perfdocs/generated/talos.rst

@@ -3446,7 +3446,6 @@ For the sample commands found below, note that the capitalization used is import
    * reporting: time from *performance.timing.navigationStart* to *pagerendered* event in ms (lower is better)
    * data: load a PDF 20 times
    * pdfpaint: True
-   * preferences: {'pdfjs.eventBusDispatchToDOM': True}
    * timeout: 600
    * tpmanifest: ${talos}/tests/pdfpaint/pdfpaint.manifest
    * tppagecycles: 20

testing/talos/talos/test.py

@@ -422,7 +422,6 @@ class pdfpaint(PageloaderTest):
     timeout = 600
     pdfpaint = True
     unit = "ms"
-    preferences = {"pdfjs.eventBusDispatchToDOM": True}
 
 
 @register_test()

toolkit/components/printing/tests/head.js

@@ -19,12 +19,6 @@ class PrintHelper {
     info("withTestPage: " + pageUrl);
     let isPdf = pageUrl.endsWith(".pdf");
 
-    if (isPdf) {
-      await SpecialPowers.pushPrefEnv({
-        set: [["pdfjs.eventBusDispatchToDOM", true]],
-      });
-    }
-
     let taskReturn = await BrowserTestUtils.withNewTab(
       isPdf ? "about:blank" : pageUrl,
       async function (browser) {

uriloader/exthandler/tests/mochitest/browser_download_open_with_internal_handler.js

@@ -35,9 +35,6 @@ function waitForAcceptButtonToGetEnabled(doc) {
 }
 
 async function waitForPdfJS(browser, url) {
-  await SpecialPowers.pushPrefEnv({
-    set: [["pdfjs.eventBusDispatchToDOM", true]],
-  });
   // Runs tests after all "load" event handlers have fired off
   let loadPromise = BrowserTestUtils.waitForContentEvent(
     browser,