Mojo: Make Channel take a RawChannel rather than creating it.

mojo/embedder/embedder.cc

Index: mojo/embedder/embedder.cc
diff --git a/mojo/embedder/embedder.cc b/mojo/embedder/embedder.cc
index 8d5f2d59b65bf85a7fd99f7abf7eaefa568002ae..ed6aecfec1df3cadbfd2a7df21d1d8c4db29d616 100644
--- a/mojo/embedder/embedder.cc
+++ b/mojo/embedder/embedder.cc
@@ -12,6 +12,7 @@
 #include "mojo/system/core_impl.h"
 #include "mojo/system/message_pipe.h"
 #include "mojo/system/message_pipe_dispatcher.h"
+#include "mojo/system/raw_channel.h"
 
 namespace mojo {
 namespace embedder {
@@ -31,7 +32,8 @@ static void CreateChannelOnIOThread(
 
   // Create and initialize a |system::Channel|.
   channel_info->channel = new system::Channel();
-  bool success = channel_info->channel->Init(platform_handle.Pass());
+  bool success = channel_info->channel->Init(
+      system::RawChannel::Create(platform_handle.Pass()));
   DCHECK(success);
 
   // Attach the message pipe endpoint.