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Most of these methods forward to |model_| and then return *this.
Inlining these reduces boilerplate.

Bug: 1106422
Change-Id: I19724548e73e117f32c38c88fae5c5beaf3f6741
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2419142
Auto-Submit: Peter Boström <pbos@chromium.org>
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808605}