If your browser is in charge of running the storage of the ciphertext and the decryption, it is much easier to debug it and apply a patch that will store the plaintext than if you have to do this all in an Android emulator as well.
But either way: DRM doesn't work for long.
In the meantime, Netflix is providing enough value for me that I happily pay their monthly fee and don't bother looking for ways to break their DRM.