Do not base64 encode the input content. (#1241)
Do not base64 encode the input content. (#1241)

Protobuf handles the base64 encoding for you, and so the content was being base64 encoded twice.
GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples