Add an IPC channel between the NaCl loader process and the renderer.

chrome/nacl/nacl_ipc_manager.cc

Index: chrome/nacl/nacl_ipc_manager.cc
===================================================================
--- chrome/nacl/nacl_ipc_manager.cc	(revision 135227)
+++ chrome/nacl/nacl_ipc_manager.cc	(working copy)
@@ -13,10 +13,14 @@
 NaClIPCManager::~NaClIPCManager() {
 }
 
+void NaClIPCManager::Init(
+    scoped_refptr<base::MessageLoopProxy> message_loop_proxy) {
+  message_loop_proxy_ = message_loop_proxy;
+}
+
 void* NaClIPCManager::CreateChannel(const IPC::ChannelHandle& handle) {
   scoped_refptr<NaClIPCAdapter> adapter(
-      new NaClIPCAdapter(handle,
-                         ChildProcess::current()->io_message_loop_proxy()));
+      new NaClIPCAdapter(handle, message_loop_proxy_.get()));
 
   // Use the object's address as the handle given to nacl. We just need a
   // unique void* to give to nacl for us to look it up when we get calls on