Change default frontend apiBaseUrl to use `document.baseURI` if present (#791)
Change default frontend apiBaseUrl to use `document.baseURI` if present (#791)

idea discussed around here https://github.com/google/data-transfer-project/issues/782#issuecomment-554247636
google/data-transfer-project,google/data-transfer-project,google/data-transfer-project,google/data-transfer-project,google/data-transfer-project