Deprecate invoking the default action for untrusted events.

third_party/WebKit/Source/core/events/EventDispatcher.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 14 matching lines @@
 
 #include "core/events/EventDispatcher.h"
 
 #include "core/dom/ContainerNode.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/events/EventDispatchMediator.h"
 #include "core/events/MouseEvent.h"
 #include "core/events/ScopedEventQueue.h"
 #include "core/events/WindowEventContext.h"
+#include "core/frame/Deprecation.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalDOMWindow.h"
 #include "core/frame/UseCounter.h"
 #include "core/inspector/InspectorTraceEvents.h"
 #include "platform/EventDispatchForbiddenScope.h"
 #include "platform/TraceEvent.h"
 #include "wtf/RefPtr.h"
 
 namespace blink {
 
@@ skipping 175 matching lines @@
     bool isTrustedOrClick = !RuntimeEnabledFeatures::trustedEventsDefaultActionEnabled() || m_event->isTrusted() || isClick;
 
     // Call default event handlers. While the DOM does have a concept of preventing
     // default handling, the detail of which handlers are called is an internal
     // implementation detail and not part of the DOM.
     if (!m_event->defaultPrevented() && !m_event->defaultHandled() && isTrustedOrClick) {
         // Non-bubbling events call only one default event handler, the one for the target.
         m_node->willCallDefaultEventHandler(*m_event);
         m_node->defaultEventHandler(m_event.get());
         ASSERT(!m_event->defaultPrevented());
-        if (m_event->defaultHandled())
-            return;
         // For bubbling events, call default event handlers on the same targets in the
         // same order as the bubbling phase.
-        if (m_event->bubbles()) {
+        if (!m_event->defaultHandled() && m_event->bubbles()) {
             size_t size = m_event->eventPath().size();
             for (size_t i = 1; i < size; ++i) {
                 m_event->eventPath()[i].node()->willCallDefaultEventHandler(*m_event);
                 m_event->eventPath()[i].node()->defaultEventHandler(m_event.get());
                 ASSERT(!m_event->defaultPrevented());
                 if (m_event->defaultHandled())
-                    return;
+                    break;
             }
         }
+        if (m_event->defaultHandled() && !m_event->isTrusted() && !isClick)
+            Deprecation::countDeprecation(m_node->document(), UseCounter::UntrustedEventDefaultHandled);
     }
 }
 
 } // namespace blink