[ios] Preparation for removing the TextFieldStyling protocol (3/5).

Switches callers to use the new version of
ChromeBrowserProvider::CreateStyledTextField().

BUG=991397

Change-Id: Iaa229f45e84f7868e15c640f3b50da724e40e26e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1742525
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#684996}