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Serializing form_data is required for server-side password generation heuristics. It was implemented on all others platforms before. Here it's implemented in gnome-keyring and libsecret backends (both of them works with Gnome keyring service).

BUG=463126

Review URL: https://codereview.chromium.org/980583002

Cr-Commit-Position: refs/heads/master@{#319628}