IxoDownloadRecord: Copy NSURL and NSArray.
IxoDownloadRecord: Copy NSURL and NSArray.

Don't take references to user instances; pointing at user
data is dangerous because we have no guarantee that the data
will not be changed (and no way to enforce that the user not
do so).

Change-Id: I97105d810c691554ca3a16beaa0333a3f7a71d43

webmproject/webm-tools,zofuthan/webm-tools,webmproject/webm-tools,zofuthan/webm-tools,webmproject/webm-tools,felipebetancur/webm-tools,zofuthan/webm-tools,felipebetancur/webm-tools,webmproject/webm-tools,felipebetancur/webm-tools,zofuthan/webm-tools,felipebetancur/webm-tools