Consolidate win/x dispatchers

ui/aura/root_window_host_linux.cc

Index: ui/aura/root_window_host_linux.cc
diff --git a/ui/aura/root_window_host_linux.cc b/ui/aura/root_window_host_linux.cc
index cd2597b60d385bd6321984de74407a4586dab1b4..db0ca97dae38a1963475877da5b639951a971aeb 100644
--- a/ui/aura/root_window_host_linux.cc
+++ b/ui/aura/root_window_host_linux.cc
@@ -348,8 +348,9 @@ RootWindowHostLinux::~RootWindowHostLinux() {
   XFreeCursor(xdisplay_, invisible_cursor_);
 }
 
-base::MessagePumpDispatcher::DispatchStatus RootWindowHostLinux::Dispatch(
-    XEvent* xev) {
+base::DispatchStatus RootWindowHostLinux::Dispatch(
+    const base::NativeEvent& event) {
+  XEvent* xev = event;
   bool handled = false;
 
   // See crbug.com/109884.
@@ -505,8 +506,7 @@ base::MessagePumpDispatcher::DispatchStatus RootWindowHostLinux::Dispatch(
       break;
     }
   }
-  return handled ? base::MessagePumpDispatcher::EVENT_PROCESSED :
-      base::MessagePumpDispatcher::EVENT_IGNORED;
+  return handled ? base::EVENT_PROCESSED : base::EVENT_IGNORED;
 }
 
 void RootWindowHostLinux::SetRootWindow(RootWindow* root_window) {