x11: Move XInput2 availability information out of the message pump.

ui/aura/root_window_host_x11.cc

Index: ui/aura/root_window_host_x11.cc
diff --git a/ui/aura/root_window_host_x11.cc b/ui/aura/root_window_host_x11.cc
index 65dde3bae668b37dc2ac70eab008783da8e4927f..4e7e774dfc1b8c2cacb88b4bfc8202fc0eea90c7 100644
--- a/ui/aura/root_window_host_x11.cc
+++ b/ui/aura/root_window_host_x11.cc
@@ -97,7 +97,7 @@ void SelectEventsForRootWindow() {
                  StructureNotifyMask | attr.your_event_mask);
   }
 
-  if (!base::MessagePumpForUI::HasXInput2())
+  if (!ui::IsXInput2Available())
     return;
 
   unsigned char mask[XIMaskLen(XI_LASTEVENT)] = {};
@@ -398,7 +398,7 @@ RootWindowHostX11::RootWindowHostX11(const gfx::Rect& bounds)
   XSelectInput(xdisplay_, xwindow_, event_mask);
   XFlush(xdisplay_);
 
-  if (base::MessagePumpForUI::HasXInput2())
+  if (ui::IsXInput2Available())
     ui::TouchFactory::GetInstance()->SetupXI2ForXWindow(xwindow_);
 
   SelectEventsForRootWindow();
@@ -1057,6 +1057,8 @@ void RootWindowHostX11::UpdateIsInternalDisplay() {
 
 void RootWindowHostX11::SetCrOSTapPaused(bool state) {
 #if defined(OS_CHROMEOS)
+  if (!ui::IsXInput2Available())
+    return;
   // Temporarily pause tap-to-click when the cursor is hidden.
   Atom prop = atom_cache_.GetAtom("Tap Paused");
   unsigned char value = state;