fixup! Bug 1743329 - Release pointer lock when xul popup is open; r=smaug,pbz

Bug 42693: Backport security fixes from Firefox 128, base/mullvad browser fixup.

dom/ipc/PBrowser.ipdl

@@ -563,6 +563,11 @@ parent:
     async RequestPointerCapture(uint32_t aPointerId) returns (bool aSuccess);
     async ReleasePointerCapture(uint32_t aPointerId);
 
+    /**
+     * Child informs the parent that a pointer lock has requested.
+     */
+    async RequestPointerLock() returns (nsCString error);
+
 both:
     /**
      * informs that a pointer lock has released.