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This change renames the HintUpdateData to StoreUpdateData to prepare
to add model and host model features into the store for the
optimization guide.

Future changes will add factory methods to support other objects to be
stored in the store used by the optimization guide.

Bug: 1001194
Change-Id: Idb6702ad84cbd374ed50e62c6aa904c681941df3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873914
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Reviewed-by: Doug Arnett <dougarnett@chromium.org>
Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708628}