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The modal will be presented from an Infobar banner (which might change in
subsequent CL's).

Adds a forward GURL declaration on InfobarSaveCardModalDelegate

Bug: 1029067
Change-Id: I6d4f69aa69ced0b93b46b36809b229cdf6b6fd05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2028743Reviewed-by: Chris Lu <thegreenfrog@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737433}