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

ui/events/platform/platform_event_source.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/events/platform/platform_event_source.h"
 
 #include <algorithm>
 
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 57 matching lines @@
 
 uint32_t PlatformEventSource::DispatchEvent(PlatformEvent platform_event) {
   uint32_t action = POST_DISPATCH_PERFORM_DEFAULT;
 
   FOR_EACH_OBSERVER(PlatformEventObserver, observers_,
                     WillProcessEvent(platform_event));
   // Give the overridden dispatcher a chance to dispatch the event first.
   if (overridden_dispatcher_)
     action = overridden_dispatcher_->DispatchEvent(platform_event);
 
-  if ((action & POST_DISPATCH_PERFORM_DEFAULT) &&
-      dispatchers_.might_have_observers()) {
-    base::ObserverList<PlatformEventDispatcher>::Iterator iter(&dispatchers_);
-    while (PlatformEventDispatcher* dispatcher = iter.GetNext()) {
-      if (dispatcher->CanDispatchEvent(platform_event))
-        action = dispatcher->DispatchEvent(platform_event);
+  if (action & POST_DISPATCH_PERFORM_DEFAULT) {
+    for (PlatformEventDispatcher& dispatcher : dispatchers_) {
+      if (dispatcher.CanDispatchEvent(platform_event))
+        action = dispatcher.DispatchEvent(platform_event);
       if (action & POST_DISPATCH_STOP_PROPAGATION)
         break;
     }
   }
   FOR_EACH_OBSERVER(PlatformEventObserver, observers_,
                     DidProcessEvent(platform_event));
 
   // If an overridden dispatcher has been destroyed, then the platform
   // event-source should halt dispatching the current stream of events, and wait
   // until the next message-loop iteration for dispatching events. This lets any
   // nested message-loop to unwind correctly and any new dispatchers to receive
   // the correct sequence of events.
   if (overridden_dispatcher_restored_)
     StopCurrentEventStream();
 
   overridden_dispatcher_restored_ = false;
 
   return action;
 }
 
 void PlatformEventSource::OnDispatcherListChanged() {
 }
 
 void PlatformEventSource::OnOverriddenDispatcherRestored() {
   CHECK(overridden_dispatcher_);
   overridden_dispatcher_restored_ = true;
 }
 
 }  // namespace ui