Bugzilla bug #30746: backed out the PR_SetConcurrency(2) workaround

because it introduced other problems.

nsprpub/pr/src/misc/prinit.c

@@ -245,16 +245,6 @@ static void _PR_InitStuff(void)
 #endif
 	
     _PR_MD_FINAL_INIT();
-
-#ifdef WINNT
-    /*
-     * Create an additional CPU thread so that if the primordial
-     * thread (a fiber) calls a native blocking function and blocks
-     * the primordial CPU thread, there is still a CPU thread that
-     * can read the I/O completion port.
-     */
-    PR_SetConcurrency(2);
-#endif
 }
 
 void _PR_ImplicitInitialization()