Use ChannelMojo for Browser-GPU and Renderer-GPU IPC.

components/nacl/renderer/ppb_nacl_private_impl.cc

Index: components/nacl/renderer/ppb_nacl_private_impl.cc
diff --git a/components/nacl/renderer/ppb_nacl_private_impl.cc b/components/nacl/renderer/ppb_nacl_private_impl.cc
index 5c318d68b0cd793043c21fe38c60c5637be0c6f7..4e097027139dd8eaa71adb0d88f024ce41d49ccd 100644
--- a/components/nacl/renderer/ppb_nacl_private_impl.cc
+++ b/components/nacl/renderer/ppb_nacl_private_impl.cc
@@ -194,17 +194,7 @@ int GetRoutingID(PP_Instance instance) {
 
 // Returns whether the channel_handle is valid or not.
 bool IsValidChannelHandle(const IPC::ChannelHandle& channel_handle) {
-  if (channel_handle.name.empty()) {
-    return false;
-  }
-
-#if defined(OS_POSIX)
-  if (channel_handle.socket.fd == -1) {
-    return false;
-  }
-#endif
-
-  return true;
+  return channel_handle.mojo_handle.is_valid();
 }
 
 void PostPPCompletionCallback(PP_CompletionCallback callback,