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This should stop the NULL dereference reported in the bug referenced below. It only targets the symptom, not the cause, though. The proper fix will hopefully come with a planned refactoring as referenced in the code comment.

BUG=420519
TBR=isherman@chromium.org

Review URL: https://codereview.chromium.org/666503002

Cr-Commit-Position: refs/heads/master@{#300143}