Generate accessors for BoxFlex{,Group}.

This patch changes the following storage_only fields to primitives:
BoxFlex{,Group}.

Diff: https://gist.github.com/nainar/ceadf28b8a152809e102df5e0de42c9a/revisions

Bug: 628043
Change-Id: Ia81bb5ec22a57a2f3a9dcb35021b5a5112b0bb6b
Reviewed-on: https://chromium-review.googlesource.com/536583
Reviewed-by: Darren Shen <[email protected]>
Commit-Queue: nainar <[email protected]>
Cr-Commit-Position: refs/heads/master@{#479960}
2 files changed