message: clean up getExportedThriftFuncHist
  Summary:
  There's no need for getExportedThriftFuncHist to return a
  pointer, so instead return a const reference.
diff: @@ -196,8 +196,8 @@ class BaseService : virtual public cpp2::BaseServiceSvIf {
  max);
  }
  - std::vector<ThriftFuncHistParams>* getExportedThriftFuncHist() {
  - return &thriftFuncHistParams_;
  + const std::vector<ThriftFuncHistParams>& getExportedThriftFuncHist() const {
  + return thriftFuncHistParams_;
  }
  /**
  