Remote socket close should produce error -100, not error -2

[bemasc]

Currently, "Socket closed by remote peer" is associated with error code -2 ("FAILURE"). This is incorrect; to match Chromium's behavior it should be error code -100 ("CONNECTION_FAILED").

[mrjingguo]

Hi, did you solved this problem?

[bemasc]

Here's a pull request that might help: #22