Fix JDK7 compatibility in branch-2.
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@ -36,7 +36,6 @@ import java.util.List;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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import java.util.concurrent.atomic.AtomicLong;
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import java.util.concurrent.atomic.LongAccumulator;
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import com.google.common.base.Function;
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import com.google.common.base.Joiner;
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