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This change makes the observed_form parameter in the APIs of
VotesUploader and PasswordSaveManager optional, since it doesn't exist
when saving or updating HTTP and proxy auth credentials.

TBR=arbesser

Bug: 943045
Change-Id: I9794c65f8950a2cb20bb4d9882cc1a2730508159
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341637
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798596}