Recommend shaka.util.LicenseRequest method be configurable.

[chemoish]

I am executing the following code and the license_server I am using only accepts method: "GET".

var license_server = ...

return new shaka.player.DrmSchemeInfo(
    'com.widevine.alpha',
    license_server,
    false, /* withCredentials */
    null, /* licensePostProcessor */
    null /* licensePreProcessor */
);

Can we please allow shaka.player.DrmSchemeInfo be configurable to handle such case?

---

https://github.com/google/shaka-player/blob/master/lib/util/license_request.js#L44

// please update me
this.parameters.method = 'POST';

[tdrews]

We can add an HTTP method override to the licenseRequestInfo object.