DevTools: allow toValue to accept unique_ptr.

Review-Url: https://codereview.chromium.org/2060463002
Cr-Original-Commit-Position: refs/heads/master@{#399272}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b8bfb7c0a31c453b81c910c69338311289bd5948
2 files changed