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a-v-y authored
This CL is extracted from https://codereview.chromium.org/2479113002. to keep it under manageable size. This changes are helpful to emulate extension controlled prefs in unit_tests. R=gab@chromium.org Review-Url: https://codereview.chromium.org/2615403002 Cr-Commit-Position: refs/heads/master@{#442215}
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