storage/app/src/main/java/com/google/firebase/referencecode/storage/StorageActivity.java [455:470]:
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                .build();

        // Update metadata properties
        forestRef.updateMetadata(metadata)
                .addOnSuccessListener(new OnSuccessListener<StorageMetadata>() {
                    @Override
                    public void onSuccess(StorageMetadata storageMetadata) {
                        // Updated metadata is in storageMetadata
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception exception) {
                        // Uh-oh, an error occurred!
                    }
                });
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storage/app/src/main/java/com/google/firebase/referencecode/storage/StorageActivity.java [483:498]:
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                .build();

        // Delete the metadata property
        forestRef.updateMetadata(metadata)
                .addOnSuccessListener(new OnSuccessListener<StorageMetadata>() {
                    @Override
                    public void onSuccess(StorageMetadata storageMetadata) {
                        // metadata.contentType should be null
                    }
                })
                .addOnFailureListener(new OnFailureListener() {
                    @Override
                    public void onFailure(@NonNull Exception exception) {
                        // Uh-oh, an error occurred!
                    }
                });
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