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Also make a few minor changes to SharedPreferencesManager to avoid
checking if a key is used twice in the same call.

Change-Id: Ie25c5fa3ec21d99d18908ea7a9df3cde6a3051ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1955909
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723403}