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

ipc/ipc_channel.h

 // 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.
 
 #ifndef IPC_IPC_CHANNEL_H_
 #define IPC_IPC_CHANNEL_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "ipc/ipc_channel_handle.h"
@@ skipping 153 matching lines @@
 
   // Returns true if the peer process' effective user id can be determined, in
   // which case the supplied client_euid is updated with it.
   bool GetClientEuid(uid_t* client_euid) const;
 
   // Closes any currently connected socket, and returns to a listening state
   // for more connections.
   void ResetToAcceptingConnectionState();
 #endif  // defined(OS_POSIX) && !defined(OS_NACL)
 
-#if defined(OS_LINUX)
-  // Configures the channel to defer OnChannelConnected() until we know the
-  // global PID of the peer.  On Linux, with sandboxed renderers, the browser
-  // cannot use the process id sent by the renderer in the hello message,
-  // because the renderer is in its own private PID namespace.  With these
-  // renderers we need to defer our call to OnChannelConnected(peer_pid) until
-  // we know the global PID.
-  void SetNeedsOverridePeerPid();
-
-  // Overrides the peer PID and calls OnChannelConnected() if necessary.
-  void OverridePeerPid(int32 peer_pid);
-#endif  // defined(OS_LINUX)
-
   // Returns true if a named server channel is initialized on the given channel
   // ID. Even if true, the server may have already accepted a connection.
   static bool IsNamedServerInitialized(const std::string& channel_id);
 
  protected:
   // Used in Chrome by the TestSink to provide a dummy channel implementation
   // for testing. TestSink overrides the "interesting" functions in Channel so
   // no actual implementation is needed. This will cause un-overridden calls to
   // segfault. Do not use outside of test code!
   Channel() : channel_impl_(0) { }
@@ skipping 11 matching lines @@
     HELLO_MESSAGE_TYPE = kuint16max  // Maximum value of message type (uint16),
                                      // to avoid conflicting with normal
                                      // message types, which are enumeration
                                      // constants starting from 0.
   };
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_H_