Make BindStateBase constructor out-of-line

The out-of-line constructor generates smaller binary after
http://crrev.com/2317563002, and the binary size growth along with
the member addition to BindStateBase is slower on the out-of-line
constructor.
This CL reduces the stripped binary size of chrome by 36kB on Linux.

Review-Url: https://codereview.chromium.org/2310093003
Cr-Commit-Position: refs/heads/master@{#417212}
2 files changed