To remove Delta Search as new tab and homepage for Google Chrome,
Start Chrome and go to the Google Chrome Menu.
Settings. - select On startup, click Open a specific page or set of pages
Click on Set Pages and delete the Delta-Search page from the list.
back to Settings screen and select Manage search engines. If Delta-Search is default search, change it and click Make Default for whatever search engine you choose instead, click Done.
Settings page one more time and click on Extensions. Remove unwanted Delta-Search extensions from the list.