Update ChannelReader to use AttachmentBroker.

ipc/ipc_channel_posix.cc

Index: ipc/ipc_channel_posix.cc
diff --git a/ipc/ipc_channel_posix.cc b/ipc/ipc_channel_posix.cc
index 6c0393b929f66a302f89e99db9c632395d292b59..83c233408b909022c67afc943df595aed9b6a107 100644
--- a/ipc/ipc_channel_posix.cc
+++ b/ipc/ipc_channel_posix.cc
@@ -798,12 +798,16 @@ ChannelPosix::ReadState ChannelPosix::ReadData(
   return READ_SUCCEEDED;
 }
 
+bool ChannelPosix::ShouldDispatchInputMessage(Message* msg) {
+  return true;
+}
+
 // On Posix, we need to fix up the file descriptors before the input message
 // is dispatched.
 //
 // This will read from the input_fds_ (READWRITE mode only) and read more
 // handles from the FD pipe if necessary.
-bool ChannelPosix::WillDispatchInputMessage(Message* msg) {
+bool ChannelPosix::GetNonBrokeredAttachments(Message* msg) {
   uint16 header_fds = msg->header()->num_fds;
   if (!header_fds)
     return true;  // Nothing to do.