Remove usage of base::ObserverList<T>::Iter::GetNext() in //ui.

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 0e655257a32558c86f56f84a353eda1b35b61389..86ca81289d7eb1c80833ad25628f036738e1a2d0 100644
--- a/ui/wm/core/compound_event_filter.cc
+++ b/ui/wm/core/compound_event_filter.cc
@@ -129,29 +129,26 @@ void CompoundEventFilter::UpdateCursor(aura::Window* target,
 }
 
 void CompoundEventFilter::FilterKeyEvent(ui::KeyEvent* event) {
-  if (handlers_.might_have_observers()) {
-    base::ObserverListBase<ui::EventHandler>::Iterator it(&handlers_);
-    ui::EventHandler* handler;
-    while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL)
-      handler->OnKeyEvent(event);
+  for (auto& handler : handlers_) {
+    if (event->stopped_propagation())

[dcheng, 2016/10/12 23:04:45]

I'm not sure that this actually needs to be checked before the first event is
dispatched, but that's the way it was originally written.

+      break;
+    handler.OnKeyEvent(event);
   }
 }
 
 void CompoundEventFilter::FilterMouseEvent(ui::MouseEvent* event) {
-  if (handlers_.might_have_observers()) {
-    base::ObserverListBase<ui::EventHandler>::Iterator it(&handlers_);
-    ui::EventHandler* handler;
-    while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL)
-      handler->OnMouseEvent(event);
+  for (auto& handler : handlers_) {
+    if (event->stopped_propagation())
+      break;
+    handler.OnMouseEvent(event);
   }
 }
 
 void CompoundEventFilter::FilterTouchEvent(ui::TouchEvent* event) {
-  if (handlers_.might_have_observers()) {
-    base::ObserverListBase<ui::EventHandler>::Iterator it(&handlers_);
-    ui::EventHandler* handler;
-    while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL)
-      handler->OnTouchEvent(event);
+  for (auto& handler : handlers_) {
+    if (event->stopped_propagation())
+      break;
+    handler.OnTouchEvent(event);
   }
 }
 
@@ -240,11 +237,10 @@ void CompoundEventFilter::OnTouchEvent(ui::TouchEvent* event) {
 }
 
 void CompoundEventFilter::OnGestureEvent(ui::GestureEvent* event) {
-  if (handlers_.might_have_observers()) {
-    base::ObserverListBase<ui::EventHandler>::Iterator it(&handlers_);
-    ui::EventHandler* handler;
-    while (!event->stopped_propagation() && (handler = it.GetNext()) != NULL)
-      handler->OnGestureEvent(event);
+  for (auto& handler : handlers_) {
+    if (event->stopped_propagation())
+      break;
+    handler.OnGestureEvent(event);
   }
 }