PPAPI/NaCl: Move handle extraction code to ppapi/proxy

chrome/nacl/nacl_ipc_adapter.h

Index: chrome/nacl/nacl_ipc_adapter.h
diff --git a/chrome/nacl/nacl_ipc_adapter.h b/chrome/nacl/nacl_ipc_adapter.h
index f9db3dc3cf6c9777596b57136a0330c005739ea0..11bb5a8314de198be942e155edd1423bc43c85e9 100644
--- a/chrome/nacl/nacl_ipc_adapter.h
+++ b/chrome/nacl/nacl_ipc_adapter.h
@@ -19,6 +19,7 @@
 #include "base/synchronization/lock.h"
 #include "base/task_runner.h"
 #include "ipc/ipc_listener.h"
+#include "ppapi/proxy/handle_converter.h"
 
 struct NaClDesc;
 struct NaClImcTypedMsgHdr;
@@ -128,11 +129,7 @@ class NaClIPCAdapter : public base::RefCountedThreadSafe<NaClIPCAdapter>,
     // to be received by the plugin.
     std::queue< scoped_refptr<RewrittenMessage> > to_be_received_;
 
-    // When we send a synchronous message (from untrusted to trusted), we store
-    // its type here, so that later we can associate the reply with its type
-    // and potentially translate handles in the message.
-    typedef std::map<int, uint32> PendingSyncMsgMap;
-    PendingSyncMsgMap pending_sync_msgs_;
+    ppapi::proxy::HandleConverter handle_converter_;
 
     // Data that we've queued from the plugin to send, but doesn't consist of a
     // full message yet. The calling code can break apart the message into