Update AffiliationFetcher to use new Affiliation API wire format.

The new format is not backward compatible with the old one, therefore this CL updates the client side protobuf definitions to be in line with the API definition. However, this CL does not yet make use of any additional fields introduced in the new wire format.

BUG=437865

Review URL: https://codereview.chromium.org/996613002

Cr-Commit-Position: refs/heads/master@{#319860}
AffiliationFetcher::AffiliationFetcher(
    net::URLRequestContextGetter* request_context_getter,
    const std::vector<FacetURI>& facet_uris,
    AffiliationFetcherDelegate* delegate)
    : request_context_getter_(request_context_getter),
      requested_facet_uris_(facet_uris),
      delegate_(delegate) {
  for (const FacetURI& uri : requested_facet_uris_) {
    DCHECK(uri.is_valid());
  }
}

AffiliationFetcher::AffiliationFetcher(
    net::URLRequestContextGetter* request_context_getter,
    const std::vector<FacetURI>& facet_uris,
    AffiliationFetcherDelegate* delegate)
    : request_context_getter_(request_context_getter),
      requested_facet_uris_(facet_uris),
      delegate_(delegate) {
  for (const FacetURI& uri : requested_facet_uris_) {
    DCHECK(uri.is_valid());
  }
}
