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The Form activity observer is now isolated from ios/web.
Move the FormActivityParams to the component.

Bug: 823285
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I4a8b9184587214a4c57839440e5ef812557b917a
Reviewed-on: https://chromium-review.googlesource.com/1193880Reviewed-by: Eugene But <eugenebut@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589123}