Change lastBytePos to long in MediaHttpDownloader.setContentRange

[mziccard]

This PR tries to fix #937.

This PR breaks clirr check with the following error:

Parameter 2 of 'public com.google.api.client.googleapis.media.MediaHttpDownloader setContentRange(long, int)' has changed its type to long

I don't see any major issue with this as MediaHttpDownloader.lastBytePos field is already a long, but correct me if I'm wrong.

[ahmadyousaf]

As if this functions receives an int, assigning it to long would still have int data. By definition, in java int can hold maximum of 2^31 - 1
If we have a file just larger than 2gb. we cannot specify lastBytePos if it's at the end of the file. On the same note, if you could also update the javadocs for this function as it says: "Sets the content range of the next download request. Eg: bytes=firstBytePos-lastBytePos."

It should rather be "... Eg: bytes=lastBytePos-firstBytePos."

[jamie-everlaw]

Any reason this hasn't been merged?

[mattwhisenhunt]

LGTM