Simplify the transport dib situation across our various platforms, as a

ui/surface/transport_dib_posix.cc

Index: ui/surface/transport_dib_posix.cc
===================================================================
--- ui/surface/transport_dib_posix.cc	(revision 192091)
+++ ui/surface/transport_dib_posix.cc	(working copy)
@@ -4,6 +4,15 @@
 
 #include "ui/surface/transport_dib.h"
 
+#if defined(TOOLKIT_GTK)
+// The GTK-specific source file overrides this POSIX implementation.
+#elif defined(OS_LINUX) && defined(USE_AURA)
+// At the moment, Aura on Linux builds use the old-style SYSV SHM based DIBs.
+// This includes Chrome OS.
+// It will change very soon.
+#include "transport_dib_gtk.cc"

[Ken Russell (switch to Gerrit), 2013/04/04 00:26:45]

That's gross -- is there a timeframe for cleaning this up?

Is there another way of handling this? Maybe explicitly calling it
transport_dib_sysv.cc and conditionally #ifdef'ing out the implementation?

+#else
+
 #include <sys/stat.h>
 #include <unistd.h>
 
@@ -95,3 +104,5 @@
 TransportDIB::Handle TransportDIB::handle() const {
   return shared_memory_.handle();
 }
+
+#endif