This is an investigational study. Onartuzumab is not FDA approved or commercially available. It is currently being used for research purposes only. Erlotinib, carboplatin, and paclitaxel are all FDA approved and commercially available for the treatment of NSCLC, but their use in this study is investigational. Radiation therapy is delivered using FDA-approved and commercially available methods. The study doctor can explain how the study drugs are designed to work.