Delete BrowserBoundKey when binding fails. (1/2)

Before this change the browser bound key would be deleted regardless of
whether the binding saved to the web data service succeeded or failed.
Ater this change, the browser bound key is delete only if saving fails.

Browser bound keys are behind the flag
chrome://flags/#enable-secure-payment-confirmation-browser-bound-key.

Bug: 377278827, 384954763
Change-Id: I25d885b82ce244a9263e7f25757a554fd9885940
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6585393
Commit-Queue: Slobodan Pejic <slobodan@chromium.org>
Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Auto-Submit: Slobodan Pejic <slobodan@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1465531}