message: Makde contentLength field long instead of int to account for blob sizes greater than 2 GB.
diff: },
  "contentLength": {
  "description": "The size of the blob in bytes. This is the same as what would be returned in the Content-Length header from the blob.",
  - "type": "integer"
  + "type": "integer",
  + "format": "int64"
  },
  "blobType": {
  "description": "The type of blob.",
  