Revert 222470 "Use an X event loop in the GPU process on Linux." This is to

trunk/src/base/message_loop/message_pump_x11.cc

Index: trunk/src/base/message_loop/message_pump_x11.cc
===================================================================
--- trunk/src/base/message_loop/message_pump_x11.cc	(revision 222588)
+++ trunk/src/base/message_loop/message_pump_x11.cc	(working copy)
@@ -158,15 +158,9 @@
   return InitializeXInput2();
 }
 
-#if defined(TOOLKIT_GTK)
+#if !defined(TOOLKIT_GTK)
 // static
 MessagePumpX11* MessagePumpX11::Current() {
-  MessageLoop* loop = MessageLoop::current();
-  return static_cast<MessagePumpX11*>(loop->pump_gpu());
-}
-#else
-// static
-MessagePumpX11* MessagePumpX11::Current() {
   MessageLoopForUI* loop = MessageLoopForUI::current();
   return static_cast<MessagePumpX11*>(loop->pump_ui());
 }