Made MessagePump a non-thread safe class.

base/message_loop/message_pump_aurax11.cc

Index: base/message_loop/message_pump_aurax11.cc
diff --git a/base/message_loop/message_pump_aurax11.cc b/base/message_loop/message_pump_aurax11.cc
index 70cae646779aa37f071b2fdbb675c79656c85ee0..d79ba4b909e78b5be06cc117f5a9f3e4ca529094 100644
--- a/base/message_loop/message_pump_aurax11.cc
+++ b/base/message_loop/message_pump_aurax11.cc
@@ -139,6 +139,13 @@ MessagePumpAuraX11::MessagePumpAuraX11() : MessagePumpGlib(),
   x_root_window_ = DefaultRootWindow(g_xdisplay);
 }
 
+MessagePumpAuraX11::~MessagePumpAuraX11() {
+  g_source_destroy(x_source_);
+  g_source_unref(x_source_);
+  XCloseDisplay(g_xdisplay);
+  g_xdisplay = NULL;
+}
+
 // static
 Display* MessagePumpAuraX11::GetDefaultXDisplay() {
   if (!g_xdisplay)
@@ -211,13 +218,6 @@ void MessagePumpAuraX11::BlockUntilWindowMapped(unsigned long xid) {
   } while (event.type != MapNotify);
 }
 
-MessagePumpAuraX11::~MessagePumpAuraX11() {
-  g_source_destroy(x_source_);
-  g_source_unref(x_source_);
-  XCloseDisplay(g_xdisplay);
-  g_xdisplay = NULL;
-}
-
 void MessagePumpAuraX11::InitXSource() {
   // CHECKs are to help track down crbug.com/113106.
   CHECK(!x_source_);