By Foo Yun Chee and Benoit Van Overstraeten BRUSSELS (Reuters) -Alphabet unit Google’s 2.42-billion-euro ($2.7 billion) EU antitrust fine should be upheld by Europe’s top court, an adviser to the court said on Thursday, dealing a potential blow to the world’s most popular internet search engine. The European Commission handed down the fine to the company in 2017 for using its own price comparison shopping service to gain an unfair advantage over smaller European rivals. The shopping case was the first of three EU decisions that resulted in a total of 8.25 billion euros in fines for Google last…