delete the unused code

cat-home/src/main/java/com/dianping/cat/helper/DateDeserializer.java

-package com.dianping.cat.helper;
-
-import java.lang.reflect.Type;
-import java.util.Date;
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
-
-import com.google.gson.JsonDeserializationContext;
-import com.google.gson.JsonDeserializer;
-import com.google.gson.JsonElement;
-import com.google.gson.JsonParseException;
-
-public class DateDeserializer implements JsonDeserializer<Date> {
-	@Override
-	public Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context)
-	      throws JsonParseException {
-		String JSONDateToMilliseconds = "\\/(Date\\((.*?)(\\+.*)?\\))\\/";
-		Pattern pattern = Pattern.compile(JSONDateToMilliseconds);
-		Matcher matcher = pattern.matcher(json.getAsJsonPrimitive().getAsString());
-		String result = matcher.replaceAll("$2");
-		return new Date(new Long(result));
-	}
-}
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