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

ipc/ipc_channel_proxy.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_PROXY_H_
 #define IPC_IPC_CHANNEL_PROXY_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 100 matching lines @@
   // passed directly to the underlying IPC::Channel.  The listener is called on
   // the thread that creates the ChannelProxy.  The filter's OnMessageReceived
   // method is called on the thread where the IPC::Channel is running.  The
   // filter may be null if the consumer is not interested in handling messages
   // on the background thread.  Any message not handled by the filter will be
   // dispatched to the listener.  The given message loop indicates where the
   // IPC::Channel should be created.
   ChannelProxy(const IPC::ChannelHandle& channel_handle,
                Channel::Mode mode,
                Channel::Listener* listener,
-               base::MessageLoopProxy* ipc_thread_loop,
-               bool needs_override_peer_pid);
+               base::MessageLoopProxy* ipc_thread_loop);
 
   virtual ~ChannelProxy();
 
   // Close the IPC::Channel.  This operation completes asynchronously, once the
   // background thread processes the command to close the channel.  It is ok to
   // call this method multiple times.  Redundant calls are ignored.
   //
   // WARNING: The MessageFilter object held by the ChannelProxy is also
   // released asynchronously, and it may in fact have its final reference
   // released on the background thread.  The caller should be careful to deal
@@ skipping 22 matching lines @@
 
   // Called to clear the pointer to the IPC message loop when it's going away.
   void ClearIPCMessageLoop();
 
 #if defined(OS_POSIX)
   // Calls through to the underlying channel's methods.
   int GetClientFileDescriptor() const;
   bool GetClientEuid(uid_t* client_euid) const;
 #endif  // defined(OS_POSIX)
 
-#if defined(OS_LINUX)
-  // Calls through to the underlying channel's method.
-  void OverridePeerPid(int32 peer_pid);
-#endif  // defined(OS_LINUX)
-
  protected:
   class Context;
   // A subclass uses this constructor if it needs to add more information
   // to the internal state.  If create_pipe_now is true, the pipe is created
   // immediately.  Otherwise it's created on the IO thread.
   ChannelProxy(const IPC::ChannelHandle& channel_handle,
                Channel::Mode mode,
                base::MessageLoopProxy* ipc_thread_loop,
-               bool needs_override_peer_pid,
                Context* context,
                bool create_pipe_now);
 
   // Used internally to hold state that is referenced on the IPC thread.
   class Context : public base::RefCountedThreadSafe<Context>,
                   public Channel::Listener {
    public:
     Context(Channel::Listener* listener, base::MessageLoopProxy* ipc_thread);
     void ClearIPCMessageLoop() { ipc_message_loop_ = NULL; }
     base::MessageLoopProxy* ipc_message_loop() const {
@@ skipping 28 matching lines @@
     // point the consumer is telling us that they don't want to receive any
     // more messages, so we honor that wish by forgetting them!
     virtual void Clear() { listener_ = NULL; }
 
    private:
     friend class ChannelProxy;
     friend class SendTask;
 
     // Create the Channel
     void CreateChannel(const IPC::ChannelHandle& channel_handle,
-                       const Channel::Mode& mode,
-                       bool needs_override_peer_pid);
+                       const Channel::Mode& mode);
 
     // Methods called on the IO thread.
     void OnSendMessage(Message* message_ptr);
     void OnAddFilter();
     void OnRemoveFilter(MessageFilter* filter);
-#if defined(OS_LINUX)
-    void OnOverridePeerPid(int32 peer_pid);
-#endif
 
     // Methods called on the listener thread.
     void AddFilter(MessageFilter* filter);
     void OnDispatchConnected();
     void OnDispatchError();
 
     scoped_refptr<base::MessageLoopProxy> listener_message_loop_;
     Channel::Listener* listener_;
 
     // List of filters.  This is only accessed on the IPC thread.
@@ skipping 14 matching lines @@
   Context* context() { return context_; }
 
   OutgoingMessageFilter* outgoing_message_filter() {
     return outgoing_message_filter_;
   }
 
  private:
   friend class SendTask;
 
   void Init(const IPC::ChannelHandle& channel_handle, Channel::Mode mode,
-            base::MessageLoopProxy* ipc_thread_loop, bool create_pipe_now,
-            bool needs_override_peer_pid);
+            base::MessageLoopProxy* ipc_thread_loop, bool create_pipe_now);
 
   // By maintaining this indirection (ref-counted) to our internal state, we
   // can safely be destroyed while the background thread continues to do stuff
   // that involves this data.
   scoped_refptr<Context> context_;
 
   OutgoingMessageFilter* outgoing_message_filter_;
 };
 
 }  // namespace IPC
 
 #endif  // IPC_IPC_CHANNEL_PROXY_H_