const google.golang.org/api/googleapi.DefaultUploadChunkSize

4 uses

	google.golang.org/api/googleapi (current package)
		googleapi.go#L57: 	DefaultUploadChunkSize = 16 * 1024 * 1024
		googleapi.go#L259: 	mo := &MediaOptions{ChunkSize: DefaultUploadChunkSize}

	google.golang.org/api/internal/gensupport
		media.go#L249: 		buffer:      NewMediaBuffer(rdr, googleapi.DefaultUploadChunkSize),

	cloud.google.com/go/storage
		storage.go#L1005: 		ChunkSize:   googleapi.DefaultUploadChunkSize,