Remove optimize_max on components/prefs
Remove optimize_max on components/prefs

I added this when prefs was split out of base (base uses optimize_max) but this is not necessary for the prefs component and we should just use the default optimization level.

Review-Url: https://codereview.chromium.org/1971003004
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#393310}

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