*.java: Switched the use of collections concrete classes to interfaces.

Jean-Noel Rouvignac

12.27.2013 d6b0cd5244b2b60ee9b222fa2d75e8b661e6262c

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user-friendly-name=Prove\u00efdor de sincronitzaci\u00f3
user-friendly-plural-name=Prove\u00efdors de sincronitzaci\u00f3