Lionel Messi walked off the Camp Nou pitch in tears, as one ofthe most dominant eras in European club soccer came to a crashinghalt.He wasn’t the only one shaking his head in disbelief.Despite going a man and two goals down in the first half,Chelsea pulled off one of the unlikeliest comebacks in ChampionsLeague history Tuesday, earning a 2-2 draw against Barcelona. Thatsent the London club into the final 3-2 on aggregate and eliminatedthe defending champion.For the second time in two weeks, Chelsea withstood anever-ending onslaught from the Spanish powerhouse and displayedruthless efficiency when rare opportunities finally presentedthemselves.”It’s a historical night for the club. I believe we deserve tobe in the final,” said Chelsea’s interim manager Roberto DiMatteo, whose team will face either Bayern Munich or Real Madrid inthe May 19 final at Munich’s Allianz Arena. ”We had a difficultseason, but we seem to always get something special out when weneed to. That’s part of the DNA of these players.”For Barcelona, the result could mark the end of one of the mostsuccessful spells in club soccer. The team was looking for a thirdChampions League title in four seasons, and this loss came right onthe heels of a 2-1 defeat to Real…