Refactors away method implementations in ui::EventTargeter

ui/wm/core/masked_window_targeter.cc

Index: ui/wm/core/masked_window_targeter.cc
diff --git a/ui/wm/core/masked_window_targeter.cc b/ui/wm/core/masked_window_targeter.cc
index 5cbdb1993b16b91adb5936500658f98b40d4fbd6..74e8bc8a7c1fad5ad21a00b1d484e70aa415f215 100644
--- a/ui/wm/core/masked_window_targeter.cc
+++ b/ui/wm/core/masked_window_targeter.cc
@@ -5,6 +5,7 @@
 #include "ui/wm/core/masked_window_targeter.h"
 
 #include "ui/aura/window.h"
+#include "ui/events/event.h"
 #include "ui/gfx/path.h"
 
 namespace wm {
@@ -16,9 +17,8 @@ MaskedWindowTargeter::MaskedWindowTargeter(aura::Window* masked_window)
 MaskedWindowTargeter::~MaskedWindowTargeter() {}
 
 bool MaskedWindowTargeter::EventLocationInsideBounds(
-    ui::EventTarget* target,
+    aura::Window* window,
     const ui::LocatedEvent& event) const {
-  aura::Window* window = static_cast<aura::Window*>(target);
   if (window == masked_window_) {
     gfx::Path mask;
     if (!GetHitTestMask(window, &mask))