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Follow up CLs will wire the fetch API up to a loader as well as invoke
the fetch API from AssistantSuggestionsController at the appropriate
points in the Assistant lifecycle.

Bug: b:148239201
Change-Id: I8eb816aab3eff180b90d4eb21371d81b6219ce0c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2018443
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735157}