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This change replaces most usage of autofill::PasswordForm in the
importer code and uses a new importer::ImportedPasswordForm struct
instead.

This is necessary, because PasswordForm is being moved to the //browser
component, and thus is no longer accessible from other components like
//common or //utility.

Bug: 1067347
Change-Id: I3789dc48d85837b75162c7b58e5ef8908b6f99eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2513220
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823461}