IsolatedWorldCSP: Fix checks in TestRunnerForSpecificView::SetIsolatedWorldInfo.

These CHECKs are triggered in clusterfuzz testing. Change them to early return
instead.

BUG=954213, 896041

Change-Id: Ie2aacc3e27dfa080e169a9064596f564449b9cd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1616945
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#660737}
1 file changed