How to restore default search engine in Chrome after you have removed malware
You may accidently delete Google search engine from Chrome. In this case you will need to manually add Google Search to the browser.
Copy and paste the search URL to the corresponding field:
{google:baseURL}search?q=%s&{google:RLZ}{google:acceptedSuggestion}{google:originalQueryForSuggestion}
{google:assistedQueryStats}{google:searchFieldtrialParameter}{google:searchClient}{google:sourceId}
{google:instantExtendedEnabledParameter}ie={inputEncoding}