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Before this patch, the Offline Prefetch feature was controlled by the
"network prediction" setting, which is shared with other features. As we
want to add specific control over this feature, this CL updates code to
add a prefetch-exclusive setting, dissociating it from the previously
shared one. It also exposes helper methods to get and set its value.

Bug: 850588
Change-Id: I45832234f3c1478f1dbde43a9cb86d7899cdb8d6
Reviewed-on: https://chromium-review.googlesource.com/1145476Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Commit-Queue: Carlos Knippschild <carlosk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578458}