ipc: Use a global for the process's attachment broker.

content/child/npapi/np_channel_base.h

Index: content/child/npapi/np_channel_base.h
diff --git a/content/child/npapi/np_channel_base.h b/content/child/npapi/np_channel_base.h
index c05dc38d8d3dbbbea4245af7e5c842d459d206e0..3a8c9e36dac57b543e87fa302306ceef9f5edcd0 100644
--- a/content/child/npapi/np_channel_base.h
+++ b/content/child/npapi/np_channel_base.h
@@ -21,10 +21,6 @@ namespace base {
 class SingleThreadTaskRunner;
 }
 
-namespace IPC {
-class AttachmentBroker;
-}
-
 namespace content {
 
 // Encapsulates an IPC channel between a renderer and another process. Used to
@@ -109,8 +105,7 @@ class NPChannelBase : public IPC::Listener,
       ChannelFactory factory,
       base::SingleThreadTaskRunner* ipc_task_runner,
       bool create_pipe_now,
-      base::WaitableEvent* shutdown_event,
-      IPC::AttachmentBroker* broker);
+      base::WaitableEvent* shutdown_event);
 
   // Sends a message to all instances.
   static void Broadcast(IPC::Message* message);
@@ -134,8 +129,7 @@ class NPChannelBase : public IPC::Listener,
 
   virtual bool Init(base::SingleThreadTaskRunner* ipc_task_runner,
                     bool create_pipe_now,
-                    base::WaitableEvent* shutdown_event,
-                    IPC::AttachmentBroker* broker);
+                    base::WaitableEvent* shutdown_event);
 
   scoped_ptr<IPC::SyncChannel> channel_;
   IPC::ChannelHandle channel_handle_;