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This also only creates the prediction manager if the feature is enabled
and overrides any target decision if feature is enabled

Bug: 1001194
Change-Id: Iea7db02a4e7b851967228df44c8ce7458118d1d3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1853863Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704835}