ipc: Remove unnecessary attachment broker plumbing.

ipc/ipc_channel_factory.h

Index: ipc/ipc_channel_factory.h
diff --git a/ipc/ipc_channel_factory.h b/ipc/ipc_channel_factory.h
index 71ebe8aaaae7e3983402644f88088295740aaeb7..4c8569cf9de42e469ba37efc87c694c85b6ac9bb 100644
--- a/ipc/ipc_channel_factory.h
+++ b/ipc/ipc_channel_factory.h
@@ -13,8 +13,6 @@
 
 namespace IPC {
 
-class AttachmentBroker;
-
 // Encapsulates how a Channel is created. A ChannelFactory can be
 // passed to the constructor of ChannelProxy or SyncChannel to tell them
 // how to create underlying channel.
@@ -23,8 +21,7 @@ class IPC_EXPORT ChannelFactory {
   // Creates a factory for "native" channel built through
   // IPC::Channel::Create().
   static scoped_ptr<ChannelFactory> Create(const ChannelHandle& handle,
-                                           Channel::Mode mode,
-                                           AttachmentBroker* broker);
+                                           Channel::Mode mode);
 
   virtual ~ChannelFactory() { }
   virtual std::string GetName() const = 0;