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If we don't do this, then we have a race condition between unloading
this extension, and trying to use it because we have manually
navigated to it.

BUG=460431

Committed: https://crrev.com/1805c4c5c4b5292cca51a54f379cde498db7238b
Cr-Commit-Position: refs/heads/master@{#318140}

Review URL: https://codereview.chromium.org/961443003

Cr-Commit-Position: refs/heads/master@{#320937}