Fix posix IPC channel hanging problem.

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 a74178a694b99dbaf4e759e30e195461a29d30ef..bd3d4fef8a63b4317f0dd6dbd60930cec6b0fa16 100644
--- a/ipc/ipc_channel_posix.cc
+++ b/ipc/ipc_channel_posix.cc
@@ -31,6 +31,7 @@
 #include "base/posix/global_descriptors.h"
 #include "base/process/process_handle.h"
 #include "base/rand_util.h"
+#include "base/run_loop.h"
 #include "base/stl_util.h"
 #include "base/strings/string_util.h"
 #include "base/synchronization/lock.h"
@@ -522,7 +523,10 @@ bool Channel::ChannelImpl::Send(Message* message) {
   message->TraceMessageBegin();
   output_queue_.push(message);
   if (!is_blocked_on_write_ && !waiting_connect_) {
-    return ProcessOutgoingMessages();
+    if (!ProcessOutgoingMessages()) {
+      ClosePipeOnError();
+      return false;
+    }
   }
 
   return true;
@@ -707,7 +711,11 @@ bool Channel::ChannelImpl::AcceptConnection() {
     // In server mode we will send a hello message when we receive one from a
     // client.
     waiting_connect_ = false;
-    return ProcessOutgoingMessages();
+    if (!ProcessOutgoingMessages()) {
+      ClosePipeOnError();
+      return false;
+    }
+    return true;
   } else if (mode_ & MODE_SERVER_FLAG) {
     waiting_connect_ = true;
     return true;