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

ipc/ipc_channel_posix.h

Index: ipc/ipc_channel_posix.h
diff --git a/ipc/ipc_channel_posix.h b/ipc/ipc_channel_posix.h
index c1aaa2b1a6c37fd17bcdf5c00d9e39db9fe787d6..b66b1fcaf9b4635e65b33b763766b61e68a4886c 100644
--- a/ipc/ipc_channel_posix.h
+++ b/ipc/ipc_channel_posix.h
@@ -62,10 +62,6 @@ class Channel::ChannelImpl : public MessageLoopForIO::Watcher {
   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:
@@ -151,10 +147,6 @@ class Channel::ChannelImpl : public MessageLoopForIO::Watcher {
   // 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);
 };