OSX: Close ipc channel if we're writing to a closed pipe.

chrome/common/ipc_channel_posix.cc

Index: chrome/common/ipc_channel_posix.cc
diff --git a/chrome/common/ipc_channel_posix.cc b/chrome/common/ipc_channel_posix.cc
index 5080dd60a5833bf6d27f5eb08a8cdc77c363a5a2..a9a81a0f67737a513cc873aa16ef26a770c54a04 100644
--- a/chrome/common/ipc_channel_posix.cc
+++ b/chrome/common/ipc_channel_posix.cc
@@ -607,6 +607,13 @@ bool Channel::ChannelImpl::ProcessOutgoingMessages() {
       msg->file_descriptor_set()->CommitAll();
 
     if (bytes_written < 0 && errno != EAGAIN) {
+#if defined(OS_MACOSX)
+      // On OSX writing to a pipe with no listener returns EPERM.
+      if (errno == EPERM) {
+        Close();
+        return false;
+      }
+#endif  // OS_MACOSX
       LOG(ERROR) << "pipe error: " << strerror(errno);
       return false;
     }