Help find what causes MBP reboot in 10.10.2
Assuming you have your Google Chrome on automatic updates, yours is the latest update version 40.0.2214.111

Why Chrome?

You crash report shows it as having problems causing other problems.

That should not crash your system, but only Chrome it self, but who knows.

What can you do?

Disable Chrome (for now) till Google comes up with a fix, and use another browser.