[ios] Moves SaveCard MessageWithLinks to its own file.

This will then be used by the SaveCardInfobarCoordinator.

Bug: 1014652
Change-Id: I2b92f3e4b818bb3844e87c15371a364797d22aec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1915819
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715323}
6 files changed