Exclude WebAuthnCableSecondFactor::model_ from rewrite_raw_ptr_field

Exclude WebAuthnCableSecondFactor::model_ from rewrite_raw_ptr_field to avoid returning a reference to a temporary T*

Change-Id: Ic88063e15b9fcdb29fcfc16d7fc3d647a11ed749
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2841973
Auto-Submit: Keishi Hattori <keishi@chromium.org>
Commit-Queue: Bartek Nowierski <bartekn@chromium.org>
Reviewed-by: Bartek Nowierski <bartekn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#874563}
GitOrigin-RevId: 83154e3234c3ee6edd2473516def376da2d1072d
1 file changed