Bug 1365513 - Remove the call to AbstractThread::GetCurrent() in nsPermissionManager.cpp. r=mystor

See bug 1365483 for the rationale.

MozReview-Commit-ID: 4sWodnP5MYZ

--HG--
extra : rebase_source : 6a32073e50695ac8f4a540c83f9d2b5542b53585
extra : intermediate-source : 5d7189453d82844d55e3d90c79792b2edd7bdd0d
extra : source : 8b029c32f3512c9d8e92582312459a501594a6e8

extensions/cookie/nsPermissionManager.cpp

@@ -11,6 +11,7 @@
 #include "mozilla/dom/ContentChild.h"
 #include "mozilla/BasePrincipal.h"
 #include "mozilla/Services.h"
+#include "mozilla/SystemGroup.h"
 #include "mozilla/Unused.h"
 #include "nsPermissionManager.h"
 #include "nsPermission.h"
@@ -3356,9 +3357,11 @@ nsPermissionManager::WhenPermissionsAvailable(nsIPrincipal* aPrincipal,
     return NS_OK;
   }
 
+  auto* thread = SystemGroup::AbstractMainThreadFor(TaskCategory::Other);
+
   RefPtr<nsIRunnable> runnable = aRunnable;
-  GenericPromise::All(AbstractThread::GetCurrent(), promises)->Then(
-    AbstractThread::GetCurrent(), __func__,
+  GenericPromise::All(thread, promises)->Then(
+    thread, __func__,
     [runnable] () { runnable->Run(); },
     [] () {
       NS_WARNING("nsPermissionManager permission promise rejected. We're probably shutting down.");

netwerk/base/nsIPermissionManager.idl

@@ -331,7 +331,9 @@ interface nsIPermissionManager : nsISupports
   /**
    * Add a callback which should be run when all permissions are available for
    * the given nsIPrincipal. This method invokes the callback runnable
-   * synchronously when the permissions are already available.
+   * synchronously when the permissions are already available. Otherwise the
+   * callback will be run asynchronously in SystemGroup when all permissions
+   * are available in the future.
    *
    * NOTE: This method will not request the permissions be sent by the parent
    * process. This should only be used to wait for permissions which may not