x11: Remove X11 message-pump.

The remaining use of the X11 mesage-pump was opening the connection to the
X11 server. This patch moves that out of the message-pump, into gfx. This
allows us to remove the X11 message-pump, and just use the base Glib-based
message-pump on Linux and ChromeOS.

BUG=354062
[email protected], [email protected]

Previously landed in r263726, but reverted in r263733 to allow reverting another CL.

Review URL: https://codereview.chromium.org/235043005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263777 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/ui/aura/demo/demo_main.cc b/ui/aura/demo/demo_main.cc
index 548aeded..21d1dda 100644
--- a/ui/aura/demo/demo_main.cc
+++ b/ui/aura/demo/demo_main.cc
@@ -2,10 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#if defined(USE_X11)
-#include <X11/Xlib.h>
-#endif
-
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/i18n/icu_util.h"
@@ -28,7 +24,7 @@
 #include "ui/gl/gl_surface.h"
 
 #if defined(USE_X11)
-#include "base/message_loop/message_pump_x11.h"
+#include "ui/gfx/x/x11_connection.h"
 #endif
 
 namespace {
@@ -111,7 +107,7 @@
 #if defined(USE_X11)
   // This demo uses InProcessContextFactory which uses X on a separate Gpu
   // thread.
-  XInitThreads();
+  gfx::InitializeThreadedX11();
 #endif
 
   gfx::GLSurface::InitializeOneOff();