Don't emit errors from the socket when we are closing it down.

Don't emit errors from the socket when we are closing it down.

The socket may be deleted at this point, so getting the error can be 'use-after-free'. Also, the actual error doesn't help, as the user can't do anything about a bad close (note that all data is 'flushed' before close is called).

BUG=https://code.google.com/p/dart/issues/detail?id=12982
R=whesse@google.com

Committed: https://code.google.com/p/dart/source/detail?r=28053

[Bill Hesse, 2013-09-30 14:56:03]

LGTM :)

[Anders Johnsen, 2013-09-30 14:57:05]

Committed patchset #1 manually as r28053 (presubmit successful).