Remove several obsolete methods from the WebAutofillClient interface.
Remove several obsolete methods from the WebAutofillClient interface.

BUG=330077
TEST=compiles
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/119573004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@164349 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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