Linux: remove the pipe errors that we spew all the time.

ipc/ipc_channel_posix.cc

Index: ipc/ipc_channel_posix.cc
diff --git a/ipc/ipc_channel_posix.cc b/ipc/ipc_channel_posix.cc
index e8065fe0a68a180b945532ee523dcde9f9d66b23..f6a6367c63068e34e123eb84535a1db9b75f1d05 100644
--- a/ipc/ipc_channel_posix.cc
+++ b/ipc/ipc_channel_posix.cc
@@ -447,6 +447,8 @@ bool Channel::ChannelImpl::ProcessIncomingMessages() {
           // to the console.
           return false;
 #endif  // defined(OS_MACOSX)
+        } else if (errno == ECONNRESET) {
+          return false;
         } else {
           PLOG(ERROR) << "pipe error (" << pipe_ << ")";
           return false;