code: function resolveReflectiveProviders(providers) {
      var /** @type {?} */ normalized = _normalizeProviders(providers, []);
      var /** @type {?} */ resolved = normalized.map(resolveReflectiveProvider);
      var /** @type {?} */ resolvedProviderMap = mergeResolvedReflectiveProviders(resolved, new Map());
      return Array.from(resolvedProviderMap.values());
  }
docs: Resolve a list of Providers.
  @param {?} providers
  @return {?}