Add targetOrigin parameter to postMessage in RehydratingConnection

This was missed in https://crrev.com/c/7063233 which prevents embedders
from receiving REHYDRATING_IFRAME_READY.

Bug: 453705035
Change-Id: I3bc28cce3a1556c651bda5a369cf05888a0c463b
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/7076796
Reviewed-by: Jack Franklin <[email protected]>
Reviewed-by: Paul Irish <[email protected]>
Commit-Queue: Sam Maddock <[email protected]>

Author: samuelmaddock

front_end/core/sdk/RehydratingConnection.ts

@@ -109,7 +109,7 @@ export class RehydratingConnection implements ProtocolClient.ConnectionTransport
     if (this.#rehydratingWindow.opener) {
       this.#rehydratingWindow.opener.postMessage({type: 'REHYDRATING_WINDOW_READY'});
     } else if (this.#rehydratingWindow !== window.top) {
-      this.#rehydratingWindow.parent.postMessage({type: 'REHYDRATING_IFRAME_READY'});
+      this.#rehydratingWindow.parent.postMessage({type: 'REHYDRATING_IFRAME_READY'}, '*');
     } else {
       this.#onConnectionLost(i18nString(UIStrings.noHostWindow));
     }