Google began testing blue-colored navigation links in June, 2015. After more than 2 months of testing, Google officially rolled out new blue-colored navigation links.
This new update officially rolled out in all countries. Check out the below image to understand it clearly.
Go to google.com and type your query. You could see “Web” in the top navigation menu is highlighted with blue color. In the same way, you could see the highlighting of top navigation menu which is active if you click on every navigation menu i.e., News, Videos, Images and etc.;
The red-colored navigation links have been used for years, and finally Google changed it to the blue color.