Remove obsolete methods from IPC::Channel and related classes.

ipc/ipc_channel_mojo.cc

Index: ipc/ipc_channel_mojo.cc
diff --git a/ipc/ipc_channel_mojo.cc b/ipc/ipc_channel_mojo.cc
index 1c21b749023414786911f28649497fa80b6ad903..6d00311a129db66704be8e3a050045463fef4592 100644
--- a/ipc/ipc_channel_mojo.cc
+++ b/ipc/ipc_channel_mojo.cc
@@ -404,16 +404,6 @@ void ChannelMojo::OnMessageReceived(const Message& message) {
     listener_->OnBadMessageReceived(message);
 }
 
-#if defined(OS_POSIX) && !defined(OS_NACL_SFI)
-int ChannelMojo::GetClientFileDescriptor() const {
-  return -1;
-}
-
-base::ScopedFD ChannelMojo::TakeClientFileDescriptor() {
-  return base::ScopedFD(GetClientFileDescriptor());
-}
-#endif  // defined(OS_POSIX) && !defined(OS_NACL_SFI)
-
 // static
 MojoResult ChannelMojo::ReadFromMessageAttachmentSet(
     Message* message,