Clean up investigation code in DeleteHelper::DoDelete

Removing a local variable to keep it in the crash dump, that is added in:
http://crrev.com/c7f0b95fefa64b7bb0accea8aafc3fb819bfdcc7

BUG=393634

Review URL: https://codereview.chromium.org/562493004

Cr-Commit-Position: refs/heads/master@{#294143}
1 file changed