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Value::GetList() will soon stop returning references to the underlying
vector. Instead it will return a thin wrapper that only allows iteration
and member access. This change prepares //components/sync* for this
switch.

Bug: 646113
Change-Id: I65cfed19643ddebd1db2dfb159493ab0c039b4a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1887695
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710985}