android/guava/src/com/google/common/collect/StandardTable.java
private boolean removeMapping(Object rowKey, Object columnKey, Object value) {
    if (containsMapping(rowKey, columnKey, value)) {
      remove(rowKey, columnKey);
      return true;
    }
    return false;
  }
private boolean removeMapping(Object rowKey, Object columnKey, Object value) {
    if (containsMapping(rowKey, columnKey, value)) {
      remove(rowKey, columnKey);
      return true;
    }
    return false;
  }
Remove a row key / column key / value mapping, if present.