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Exchanged storing WebFormElements and WebFormControlElements by storing only their unique renderer ids.

Change-Id: I9ca873a285d327001e4f29a828c0eb02e97fe48d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1663414
Commit-Queue: Matthias Körber <koerber@google.com>
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676070}