ChannelMojo: Make MOJO_RESULT_FAILED_PRECONDITION an error.

ipc/mojo/ipc_message_pipe_reader.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ipc/mojo/ipc_message_pipe_reader.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 134 matching lines @@
   DCHECK(0 == num_handles || handle_buffer_.size() == num_handles);
   return result;
 }
 
 void MessagePipeReader::ReadAvailableMessages() {
   while (pipe_.is_valid()) {
     MojoResult read_result = ReadMessageBytes();
     if (read_result == MOJO_RESULT_SHOULD_WAIT)
       break;
     if (read_result != MOJO_RESULT_OK) {
-      // FAILED_PRECONDITION means that all the received messages
-      // got consumed and the peer is already closed.
-      if (read_result != MOJO_RESULT_FAILED_PRECONDITION) {
-        DLOG(WARNING)
-            << "Pipe got error from ReadMessage(). Closing: " << read_result;
-        OnPipeError(read_result);
-      }
-
+      DLOG(WARNING)
+          << "Pipe got error from ReadMessage(). Closing: " << read_result;
+      OnPipeError(read_result);
       Close();
       break;
     }
 
     OnMessageReceived();
   }
 
 }
 
 void MessagePipeReader::ReadMessagesThenWait() {
@@ skipping 48 matching lines @@
 
 void MessagePipeReader::DelayedDeleter::operator()(
     MessagePipeReader* ptr) const {
   ptr->Close();
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                 base::Bind(&DeleteNow, ptr));
 }
 
 }  // namespace internal
 }  // namespace IPC