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Modify SocketStream::Finish so that it works correctly if the delegate
calls DetachDelegate() and then deletes itself from within the OnError()
callback.

Test the delegate deleting itself in OnError().

SocketStream::Delegate is permitted to call
SocketStream::DetachDelegate() and then delete itself from within the
OnError method. Ensure this works correctly.

BUG=
TEST=net_unittests layout tests

Review URL: https://chromiumcodereview.appspot.com/15989003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@202414 0039d316-1c4b-4281-b951-d872f2087c98