Add an "Ok, got it" string for the notice about other forms of history.
Add an "Ok, got it" string for the notice about other forms of history.

BUG=595332

Review URL: https://codereview.chromium.org/1867603002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#385695}

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