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Password Manager keeps the map from WebFormControlElement to last
non-JavaScript value in FieldValueAndPropertiesMaskMap. That's bad from
memory consumption perspective since it keeps input elements in memory
even if they were removed from DOM (and WebFormControlElement keep
s whole WebForm). Now we have reliable mechanism - unique renderer ids,
which might be used instead of WebFormControlElement. This CL replaces
usages of WebFormControlElement with unique renderer ids.

Also this CL contains small clean-up in password_autofill_agent.h:
removing not used typedef and typedef to using conversion.

Bug: 831123, 734427
Change-Id: I12a7b53859fccb9c5398997c61250ccf1a4f5c89
Reviewed-on: https://chromium-review.googlesource.com/1085460
Commit-Queue: Vadym Doroshenko <dvadym@chromium.org>
Reviewed-by: Vaclav Brozek <vabr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565623}