Remove TransparentActivateWindowButton from Overview Mode

ui/aura/window.cc

Index: ui/aura/window.cc
diff --git a/ui/aura/window.cc b/ui/aura/window.cc
index 91df99eefcdfb8dbd07b9f66e5522c71b069a59a..4b26c57a6bce79b34804413daee9851278cd8fa4 100644
--- a/ui/aura/window.cc
+++ b/ui/aura/window.cc
@@ -805,6 +805,10 @@ void Window::OnDeviceScaleFactorChanged(float device_scale_factor) {
     delegate_->OnDeviceScaleFactorChanged(device_scale_factor);
 }
 
+ui::EventTargeter* Window::GetEventTargeter() {
+  return targeter_.get();
+}
+
 #if !defined(NDEBUG)
 std::string Window::GetDebugInfo() const {
   return base::StringPrintf(
@@ -1429,10 +1433,6 @@ scoped_ptr<ui::EventTargetIterator> Window::GetChildIterator() const {
   return make_scoped_ptr(new ui::EventTargetIteratorImpl<Window>(children()));
 }
 
-ui::EventTargeter* Window::GetEventTargeter() {
-  return targeter_.get();
-}
-
 void Window::ConvertEventToTarget(ui::EventTarget* target,
                                   ui::LocatedEvent* event) {
   event->ConvertLocationToTarget(this,