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

content/renderer/npapi/plugin_channel_host.h

Index: content/renderer/npapi/plugin_channel_host.h
diff --git a/content/renderer/npapi/plugin_channel_host.h b/content/renderer/npapi/plugin_channel_host.h
index dd9dd1b51c769a380d1227f7dec04f4a448d4fcc..6c6f8e2593f22bf26eed19670209a43ce8b64d7d 100644
--- a/content/renderer/npapi/plugin_channel_host.h
+++ b/content/renderer/npapi/plugin_channel_host.h
@@ -9,10 +9,6 @@
 #include "content/child/npapi/np_channel_base.h"
 #include "ipc/ipc_channel_handle.h"
 
-namespace IPC {
-class AttachmentBroker;
-}
-
 namespace content {
 class NPObjectBase;
 
@@ -27,13 +23,11 @@ class PluginChannelHost : public NPChannelBase {
 #endif
   static PluginChannelHost* GetPluginChannelHost(
       const IPC::ChannelHandle& channel_handle,
-      base::SingleThreadTaskRunner* ipc_task_runner,
-      IPC::AttachmentBroker* broker);
+      base::SingleThreadTaskRunner* ipc_task_runner);
 
   bool Init(base::SingleThreadTaskRunner* ipc_task_runner,
             bool create_pipe_now,
-            base::WaitableEvent* shutdown_event,
-            IPC::AttachmentBroker* broker) override;
+            base::WaitableEvent* shutdown_event) override;
 
   int GenerateRouteID() override;