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Done via enabling FormActivityObserver for PasswordController.
Now forms are reparsed if a new form appears or if there is a change
in an already existing form.

Bug: 904268
Change-Id: Idc0b0f767bae2e869cb3f99d292165264b636992
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2082387
Commit-Queue: Maria Kazinova <kazinova@google.com>
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748159}