Use ChannelMojo from the browser to NaCl loader process.

components/nacl/loader/nacl_listener.h

Index: components/nacl/loader/nacl_listener.h
diff --git a/components/nacl/loader/nacl_listener.h b/components/nacl/loader/nacl_listener.h
index 2b0fdb6f269a07ebbb528ea5df89dceefb8110f8..533681cd8e0f2d4dd2061ec9ab7411799550bf22 100644
--- a/components/nacl/loader/nacl_listener.h
+++ b/components/nacl/loader/nacl_listener.h
@@ -28,6 +28,12 @@ class SyncChannel;
 class SyncMessageFilter;
 }
 
+namespace mojo {
+namespace edk {
+class ScopedIPCSupport;
+}  // namespace edk
+}  // namespace mojo
+
 // The NaClListener is an IPC channel listener that waits for a
 // request to start a NaCl module.
 class NaClListener : public IPC::Listener {
@@ -119,6 +125,8 @@ class NaClListener : public IPC::Listener {
 
   bool is_started_;
 
+  std::unique_ptr<mojo::edk::ScopedIPCSupport> mojo_ipc_support_;
+
   DISALLOW_COPY_AND_ASSIGN(NaClListener);
 };