components: Cleanup class/struct fwd declarations

components/nacl/broker/nacl_broker_listener.h

Index: components/nacl/broker/nacl_broker_listener.h
diff --git a/components/nacl/broker/nacl_broker_listener.h b/components/nacl/broker/nacl_broker_listener.h
index 4077f78fd6409db7b64391894d072c563874b037..feb5a25054a74c50a4280930140b542f84ffa5f2 100644
--- a/components/nacl/broker/nacl_broker_listener.h
+++ b/components/nacl/broker/nacl_broker_listener.h
@@ -20,12 +20,6 @@ namespace IPC {
 class Channel;
 }
 
-namespace mojo {
-namespace edk {
-class ScopedIPCSupport;
-}  // namespace edk
-}  // namespace mojo
-
 // The BrokerThread class represents the thread that handles the messages from
 // the browser process and starts NaCl loader processes.
 class NaClBrokerListener : public content::SandboxedProcessLauncherDelegate,