Bug 1749996 - Ensure CrashMonitor writes sessionstore final checkpoint before IOUtils shuts down r=Gijs

Differential Revision: https://phabricator.services.mozilla.com/D137797

browser/components/sessionstore/SessionFile.jsm

@@ -28,9 +28,6 @@ const { Services } = ChromeUtils.import("resource://gre/modules/Services.jsm");
 const { XPCOMUtils } = ChromeUtils.import(
   "resource://gre/modules/XPCOMUtils.jsm"
 );
-const { AsyncShutdown } = ChromeUtils.import(
-  "resource://gre/modules/AsyncShutdown.jsm"
-);
 
 XPCOMUtils.defineLazyModuleGetters(this, {
   RunState: "resource:///modules/sessionstore/RunState.jsm",
@@ -488,7 +485,7 @@ var SessionFileInternal = {
 
     // Ensure that we can write sessionstore.js cleanly before the profile
     // becomes unaccessible.
-    AsyncShutdown.profileBeforeChange.addBlocker(
+    IOUtils.profileBeforeChange.addBlocker(
       "SessionFile: Finish writing Session Restore data",
       promise,
       {
@@ -506,7 +503,7 @@ var SessionFileInternal = {
     // doesn't forward the rejection.
     return promise.then(() => {
       // Remove the blocker, no matter if writing failed or not.
-      AsyncShutdown.profileBeforeChange.removeBlocker(promise);
+      IOUtils.profileBeforeChange.removeBlocker(promise);
 
       if (isFinalWrite) {
         Services.obs.notifyObservers(