The debugger calls PromiseHasUserDefinedRejectHandler to recursively search the
tree of dependent promises for user-defined reject handlers. If no such reject
handler exists, rejecting the promise is considered an uncaught exception.

Promise.race and Promise.all interupt the link of promise dependency wrt the
search. This change fixes that link.

R=rossberg@chromium.org
BUG=chromium:439585
LOG=N

Review URL: https://codereview.chromium.org/1411083003

Cr-Commit-Position: refs/heads/master@{#31392}