Bug 1943789 - Remove sleep so UI doesn't freeze r=stransky

Differential Revision: https://phabricator.services.mozilla.com/D237002

widget/gtk/nsClipboardWayland.cpp

@@ -61,8 +61,6 @@ ClipboardData nsRetrievalContextWayland::WaitForClipboardData(
   PRTime entryTime = PR_Now();
   while (!request.HasCompleted()) {
     if (iteration++ > kClipboardFastIterationNum) {
-      /* sleep for 10 ms/iteration */
-      PR_Sleep(PR_MillisecondsToInterval(10));
       if (PR_Now() - entryTime > kClipboardTimeout) {
         MOZ_CLIPBOARD_LOG(
             "  failed to get async clipboard data in time limit\n");

widget/gtk/nsDragService.cpp

@@ -1452,7 +1452,6 @@ RefPtr<DragData> nsDragSession::GetDragData(GdkAtom aRequestedFlavor) {
     // check the number of iterations
     LOGDRAGSERVICE("  doing iteration, mWaitingForDragDataRequests %d ...",
                    mWaitingForDragDataRequests);
-    PR_Sleep(PR_MillisecondsToInterval(10)); /* sleep for 10 ms/iteration */
     if (PR_Now() - entryTime > NS_DND_TIMEOUT) {
       LOGDRAGSERVICE("  failed to get D&D data in time!\n");
       break;