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Before this patch the direct action list_assistant_action was used to
start autofill assistant and to return available actions. That is
misleading and this patch disconnects that by renaming
list_assistant_action to fetch_website_actions and return a success
bool instead of a list of actions.

Out of scope for this patch: the next step will be to tie the
availability of the fetch_website_actions action to controller state
and to remove perform_assistant_action entirely.

Bug: b/138833619
Change-Id: I279e5bc2e6d13a48151d5c161483a2b9662dd940
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1873752
Commit-Queue: Mathias Carlen <mcarlen@chromium.org>
Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709832}