base: Stop passing a non-const ref to ObserverListBase::Iterator.

ui/wm/core/compound_event_filter.cc

Index: ui/wm/core/compound_event_filter.cc
diff --git a/ui/wm/core/compound_event_filter.cc b/ui/wm/core/compound_event_filter.cc
index 134e3821ab8c6a63d74ff9d97b5ea466d16a2462..490bc13d7561dc2c3f831c7e27b6c0c3a2cd9f1f 100644
--- a/ui/wm/core/compound_event_filter.cc
+++ b/ui/wm/core/compound_event_filter.cc
@@ -130,7 +130,7 @@ void CompoundEventFilter::UpdateCursor(aura::Window* target,
 
 void CompoundEventFilter::FilterKeyEvent(ui::KeyEvent* event) {
   if (handlers_.might_have_observers()) {
-    ObserverListBase<ui::EventHandler>::Iterator it(handlers_);
+    ObserverListBase<ui::EventHandler>::Iterator it(&handlers_);
     ui::EventHandler* handler;
     while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL)
       handler->OnKeyEvent(event);
@@ -139,7 +139,7 @@ void CompoundEventFilter::FilterKeyEvent(ui::KeyEvent* event) {
 
 void CompoundEventFilter::FilterMouseEvent(ui::MouseEvent* event) {
   if (handlers_.might_have_observers()) {
-    ObserverListBase<ui::EventHandler>::Iterator it(handlers_);
+    ObserverListBase<ui::EventHandler>::Iterator it(&handlers_);
     ui::EventHandler* handler;
     while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL)
       handler->OnMouseEvent(event);
@@ -148,7 +148,7 @@ void CompoundEventFilter::FilterMouseEvent(ui::MouseEvent* event) {
 
 void CompoundEventFilter::FilterTouchEvent(ui::TouchEvent* event) {
   if (handlers_.might_have_observers()) {
-    ObserverListBase<ui::EventHandler>::Iterator it(handlers_);
+    ObserverListBase<ui::EventHandler>::Iterator it(&handlers_);
     ui::EventHandler* handler;
     while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL)
       handler->OnTouchEvent(event);
@@ -242,7 +242,7 @@ void CompoundEventFilter::OnTouchEvent(ui::TouchEvent* event) {
 
 void CompoundEventFilter::OnGestureEvent(ui::GestureEvent* event) {
   if (handlers_.might_have_observers()) {
-    ObserverListBase<ui::EventHandler>::Iterator it(handlers_);
+    ObserverListBase<ui::EventHandler>::Iterator it(&handlers_);
     ui::EventHandler* handler;
     while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL)
       handler->OnGestureEvent(event);