GTK: Adds #error statements to GTK code to root out unknown bots.

base/message_loop/message_pump_gtk.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_loop/message_pump_gtk.h"
 
 #include <gtk/gtk.h>
 #include <gdk/gdkx.h>
 
 #include "base/debug/trace_event.h"
 #include "base/profiler/scoped_profile.h"
 
+#error "The GTK+ port will be deleted later this week. If you are seeing this, you are trying to compile it. Please check your gyp flags for 'use_aura=0' and remove them."
+
 namespace base {
 
 namespace {
 
 ALLOW_UNUSED const char* EventToTypeString(const GdkEvent* event) {
   switch (event->type) {
     case GDK_NOTHING:           return "GDK_NOTHING";
     case GDK_DELETE:            return "GDK_DELETE";
     case GDK_DESTROY:           return "GDK_DESTROY";
     case GDK_EXPOSE:            return "GDK_EXPOSE";
@@ skipping 88 matching lines @@
                     DidProcessEvent(event));
 }
 
 // static
 void MessagePumpGtk::EventDispatcher(GdkEvent* event, gpointer data) {
   MessagePumpGtk* message_pump = reinterpret_cast<MessagePumpGtk*>(data);
   message_pump->DispatchEvents(event);
 }
 
 }  // namespace base