This avoids the inclusion of inline headers (i.e. vm-state-inl.h in this
case) in a normal header. There are three more such violations left in
the code-base after this change.

R=verwaest@chromium.org

Review-Url: https://codereview.chromium.org/2039913002
Cr-Commit-Position: refs/heads/master@{#36781}