[rfc][icedtea-web] Fix two memory leaks

[Adam Domurad]

get_cookie_info and get_proxy_info take a char** that holds a result 
from an NPN_GetValueForURLPtr browser callback.

This string is not freed, however the documentation [1] states the 
plugin is responsible for freeing the buffer.

2012-11-19  Adam Domurad  <adomurad at redhat.com>

     * plugin/icedteanp/IcedTeaNPPlugin.cc
     (consume_plugin_message): Free two buffers returned from 
NPN_GetValueForURL function.


[1]  https://developer.mozilla.org/en-US/docs/NPN_GetValueForURL
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