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

content/plugin/plugin_channel.cc

Index: content/plugin/plugin_channel.cc
diff --git a/content/plugin/plugin_channel.cc b/content/plugin/plugin_channel.cc
index c37eb0c2f6dfd3557619cd2ca7c1535e28fec4a2..90993e94725748a27a0ccaac1ac000cd6bedb6aa 100644
--- a/content/plugin/plugin_channel.cc
+++ b/content/plugin/plugin_channel.cc
@@ -141,8 +141,7 @@ class PluginChannel::MessageFilter : public IPC::MessageFilter {
 
 PluginChannel* PluginChannel::GetPluginChannel(
     int renderer_id,
-    base::SingleThreadTaskRunner* ipc_task_runner,
-    IPC::AttachmentBroker* broker) {
+    base::SingleThreadTaskRunner* ipc_task_runner) {
   // Map renderer ID to a (single) channel to that process.
   std::string channel_key = base::StringPrintf(
       "%d.r%d", base::GetCurrentProcId(), renderer_id);
@@ -150,7 +149,7 @@ PluginChannel* PluginChannel::GetPluginChannel(
   PluginChannel* channel =
       static_cast<PluginChannel*>(NPChannelBase::GetChannel(
           channel_key, IPC::Channel::MODE_SERVER, ClassFactory, ipc_task_runner,
-          false, ChildProcess::current()->GetShutDownEvent(), broker));
+          false, ChildProcess::current()->GetShutDownEvent()));
 
   if (channel)
     channel->renderer_id_ = renderer_id;
@@ -226,12 +225,9 @@ void PluginChannel::CleanUp() {
 
 bool PluginChannel::Init(base::SingleThreadTaskRunner* ipc_task_runner,
                          bool create_pipe_now,
-                         base::WaitableEvent* shutdown_event,
-                         IPC::AttachmentBroker* broker) {
-  if (!NPChannelBase::Init(ipc_task_runner, create_pipe_now, shutdown_event,
-                           broker)) {
+                         base::WaitableEvent* shutdown_event) {
+  if (!NPChannelBase::Init(ipc_task_runner, create_pipe_now, shutdown_event))
     return false;
-  }
 
   channel_->AddFilter(filter_.get());
   return true;