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GetAvatarIcon, GetAvatarIconIndex, SetAvatarIconIndex, and
GetHighResAvatar are migrated to ProfileAttributesEntry. Old accessors
are still here (with some extra comment) because they are still used by
ProfileInfoCache tests.

Two high-res avatar tests are migrated and one test about avatar icon
index is added.

An existing observer notifier method in ProfileAttributesStorage is
changed because it was not good enough.

Bug: 305720
Change-Id: I93b3e765cd1131f7ddb905c884db6d23390786bb
Reviewed-on: https://chromium-review.googlesource.com/694062Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Commit-Queue: WC Leung <lwchkg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505876}