Mojo: (Theoretically) implement the read side of platform handle passing.

mojo/system/channel.cc

Index: mojo/system/channel.cc
diff --git a/mojo/system/channel.cc b/mojo/system/channel.cc
index 32f56e1d9a2926fc4df1fe96e5d9ba3fe37dd76e..228c441e214be96824c49ca99723bb60de70b7e7 100644
--- a/mojo/system/channel.cc
+++ b/mojo/system/channel.cc
@@ -273,10 +273,6 @@ Channel::~Channel() {
 }
 
 void Channel::OnReadMessage(const MessageInTransit::View& message_view) {
-  // Note: |ValidateReadMessage()| will call |HandleRemoteError()| if necessary.
-  if (!ValidateReadMessage(message_view))
-    return;
-
   switch (message_view.type()) {
     case MessageInTransit::kTypeMessagePipeEndpoint:
     case MessageInTransit::kTypeMessagePipe:
@@ -298,17 +294,6 @@ void Channel::OnFatalError(FatalError fatal_error) {
   Shutdown();
 }
 
-bool Channel::ValidateReadMessage(const MessageInTransit::View& message_view) {
-  const char* error_message = NULL;
-  if (!message_view.IsValid(&error_message)) {
-    DCHECK(error_message);
-    HandleRemoteError(error_message);
-    return false;
-  }
-
-  return true;
-}
-
 void Channel::OnReadMessageForDownstream(
     const MessageInTransit::View& message_view) {
   DCHECK(message_view.type() == MessageInTransit::kTypeMessagePipeEndpoint ||