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

ipc/ipc_channel_posix.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_POSIX_H_
 #define IPC_IPC_CHANNEL_POSIX_H_
 #pragma once
 
 #include "ipc/ipc_channel.h"
 
@@ skipping 44 matching lines @@
   virtual ~ChannelImpl();
   bool Connect();
   void Close();
   void set_listener(Listener* listener) { listener_ = listener; }
   bool Send(Message* message);
   int GetClientFileDescriptor() const;
   bool AcceptsConnections() const;
   bool HasAcceptedConnection() const;
   bool GetClientEuid(uid_t* client_euid) const;
   void ResetToAcceptingConnectionState();
-#if defined(OS_LINUX)
-  void SetNeedsOverridePeerPid();
-  void OverridePeerPid(int32 peer_pid);
-#endif  // defined(OS_LINUX)
   static bool IsNamedServerInitialized(const std::string& channel_id);
 
  private:
   bool CreatePipe(const IPC::ChannelHandle& channel_handle);
 
   bool ProcessIncomingMessages();
   bool ProcessOutgoingMessages();
 
   bool AcceptConnection();
   void ClosePipeOnError();
@@ skipping 65 matching lines @@
 #endif
 
   // Large messages that span multiple pipe buffers, get built-up using
   // this buffer.
   std::string input_overflow_buf_;
   std::vector<int> input_overflow_fds_;
 
   // True if we are responsible for unlinking the unix domain socket file.
   bool must_unlink_;
 
-  // See IPC::Channel::SetNeedsOverridePeerPid() header comment for details.
-  bool needs_override_peer_pid_;
-  int32 override_peer_pid_;
-
   DISALLOW_IMPLICIT_CONSTRUCTORS(ChannelImpl);
 };
 
 // The maximum length of the name of a pipe for MODE_NAMED_SERVER or
 // MODE_NAMED_CLIENT if you want to pass in your own socket.
 // The standard size on linux is 108, mac is 104. To maintain consistency
 // across platforms we standardize on the smaller value.
 static const size_t kMaxPipeNameLength = 104;
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_POSIX_H_