This patch caused Chrome to be unable to load any web pages on Chrome OS.

ipc/ipc_tests.cc

 // Copyright (c) 2011 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 "build/build_config.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(OS_POSIX)
 #include <sys/types.h>
@@ skipping 233 matching lines @@
   MyChannelListener channel_listener;
 
   // The thread needs to out-live the ChannelProxy.
   base::Thread thread("ChannelProxyTestServer");
   base::Thread::Options options;
   options.message_loop_type = MessageLoop::TYPE_IO;
   thread.StartWithOptions(options);
   {
     // setup IPC channel proxy
     IPC::ChannelProxy chan(kTestClientChannel, IPC::Channel::MODE_SERVER,
-                           &channel_listener, thread.message_loop_proxy(),
-                           false /* needs_override_peer_pid */);
+                           &channel_listener, thread.message_loop_proxy());
 
     channel_listener.Init(&chan);
 
 #if defined(OS_WIN)
     base::ProcessHandle process_handle = SpawnChild(TEST_CLIENT, NULL);
 #elif defined(OS_POSIX)
     bool debug_on_start = CommandLine::ForCurrentProcess()->HasSwitch(
                               switches::kDebugChildren);
     base::file_handle_mapping_vector fds_to_map;
     const int ipcfd = chan.GetClientFileDescriptor();
@@ skipping 272 matching lines @@
 #endif  // PERFORMANCE_TEST
 
 int main(int argc, char** argv) {
 #ifdef PERFORMANCE_TEST
   int retval = base::PerfTestSuite(argc, argv).Run();
 #else
   int retval = base::TestSuite(argc, argv).Run();
 #endif
   return retval;
 }