Mojo: Move public C system header files to mojo/public/c/system/.

mojo/examples/aura_demo/aura_demo.cc

 // Copyright 2013 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 <stdio.h>
 #include <string>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "mojo/examples/aura_demo/demo_screen.h"
 #include "mojo/examples/aura_demo/window_tree_host_mojo.h"
 #include "mojo/public/bindings/allocation_scope.h"
+#include "mojo/public/c/system/core.h"
+#include "mojo/public/c/system/macros.h"
 #include "mojo/public/gles2/gles2_cpp.h"
 #include "mojo/public/shell/application.h"
 #include "mojo/public/shell/shell.mojom.h"
-#include "mojo/public/system/core.h"
-#include "mojo/public/system/macros.h"
 #include "mojo/services/native_viewport/native_viewport.mojom.h"
 #include "ui/aura/client/default_capture_client.h"
 #include "ui/aura/client/window_tree_client.h"
 #include "ui/aura/env.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/base/hit_test.h"
 #include "ui/gfx/canvas.h"
 
 #if defined(WIN32)
@@ skipping 155 matching lines @@
 
   // TODO(beng): This crashes in a DCHECK on X11 because this thread's
   //             MessageLoop is not of TYPE_UI. I think we need a way to build
   //             Aura that doesn't define platform-specific stuff.
   aura::Env::CreateInstance();
   mojo::examples::AuraDemo app(shell_handle);
   loop.Run();
 
   return MOJO_RESULT_OK;
 }