So only 2/5 of the ones you mentioned were started in-house, and all were pre-2010 (pre-Sundar) creations.
edit: Sundar joined Google in 2004 and apparently led Maps, Chrome, and eventually Android before becoming CEO. So "pre-Sundar" is technically incorrect.
This characterization is pretty misleading. For example, the Google Maps that was acquired was a C++ desktop application. What most people think of as Google Maps (the AJAX web app) was built and launched by Google.
Android: acquired in 2005
Google Sheets: acquired in 2006
Translate: launched in 2006
Chrome: launched in 2008
So only 2/5 of the ones you mentioned were started in-house, and all were pre-2010 (pre-Sundar) creations.
edit: Sundar joined Google in 2004 and apparently led Maps, Chrome, and eventually Android before becoming CEO. So "pre-Sundar" is technically incorrect.