Fix launching files via chrome.app.runtime.onLaunched.
Fix launching files via chrome.app.runtime.onLaunched.

zkendall/WordBinder,modulexcite/text-app,codex8/text-app,codex8/text-app,modulexcite/text-app,l3dlp/text-app,zkendall/WordBinder,l3dlp/text-app,codex8/text-app,modulexcite/text-app,zkendall/WordBinder,l3dlp/text-app