Google has agreed to make changes to its online advertising business in a settlement with the French government.The agreement, announced Monday, requires Google to pay a $268 million fine for abusing its "dominant position" in the online advertising market.The French Competition Authority said it had found that Google's ad management system for large publishers favored its own online ad marketplace, AdX, over competitors.AdX is a tool used by publishers to sell advertising space.French officials said AdX is built to work more effectively with the service Google Ad Manager than with other ad placement providers.Google did not dispute the findings and said it had agreed to make changes to its advertising business as part of the settlement.The company promised to improve the way its Ad Manager services work with competing online advertising systems.