Remove the (already disabled) OverflowChangedEvent runtime flag

Source/core/layout/LayoutBlock.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 15 matching lines @@
 
 #include "core/HTMLNames.h"
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/Document.h"
 #include "core/dom/Element.h"
 #include "core/dom/StyleEngine.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/Editor.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/htmlediting.h"
-#include "core/events/OverflowEvent.h"
 #include "core/fetch/ResourceLoadPriorityOptimizer.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLMarqueeElement.h"
 #include "core/layout/HitTestLocation.h"
 #include "core/layout/HitTestResult.h"
 #include "core/layout/LayoutAnalyzer.h"
 #include "core/layout/LayoutDeprecatedFlexibleBox.h"
 #include "core/layout/LayoutFlexibleBox.h"
@@ skipping 44 matching lines @@
 static TrackedDescendantsMap* gPositionedDescendantsMap = nullptr;
 static TrackedDescendantsMap* gPercentHeightDescendantsMap = nullptr;
 
 static TrackedContainerMap* gPositionedContainerMap = nullptr;
 static TrackedContainerMap* gPercentHeightContainerMap = nullptr;
 
 typedef WTF::HashSet<LayoutBlock*> DelayedUpdateScrollInfoSet;
 static int gDelayUpdateScrollInfo = 0;
 static DelayedUpdateScrollInfoSet* gDelayedUpdateScrollInfoSet = nullptr;
 
-// This class helps dispatching the 'overflow' event on layout change. overflow can be set on LayoutBoxes, yet the existing code
-// only works on LayoutBlocks. If this changes, this class should be shared with other LayoutBoxes.
-class OverflowEventDispatcher {
-    WTF_MAKE_NONCOPYABLE(OverflowEventDispatcher);
-public:
-    OverflowEventDispatcher(const LayoutBlock* block)
-        : m_block(block)
-        , m_hadHorizontalLayoutOverflow(false)
-        , m_hadVerticalLayoutOverflow(false)
-    {
-        m_shouldDispatchEvent = !m_block->isAnonymous() && m_block->hasOverflowClip() && m_block->document().hasListenerType(Document::OVERFLOWCHANGED_LISTENER);
-        if (m_shouldDispatchEvent) {
-            m_hadHorizontalLayoutOverflow = m_block->hasHorizontalLayoutOverflow();
-            m_hadVerticalLayoutOverflow = m_block->hasVerticalLayoutOverflow();
-        }
-    }
-
-    ~OverflowEventDispatcher()
-    {
-        if (!m_shouldDispatchEvent)
-            return;
-
-        bool hasHorizontalLayoutOverflow = m_block->hasHorizontalLayoutOverflow();
-        bool hasVerticalLayoutOverflow = m_block->hasVerticalLayoutOverflow();
-
-        bool horizontalLayoutOverflowChanged = hasHorizontalLayoutOverflow != m_hadHorizontalLayoutOverflow;
-        bool verticalLayoutOverflowChanged = hasVerticalLayoutOverflow != m_hadVerticalLayoutOverflow;
-
-        if (!horizontalLayoutOverflowChanged && !verticalLayoutOverflowChanged)
-            return;
-
-        RefPtrWillBeRawPtr<OverflowEvent> event = OverflowEvent::create(horizontalLayoutOverflowChanged, hasHorizontalLayoutOverflow, verticalLayoutOverflowChanged, hasVerticalLayoutOverflow);
-        event->setTarget(m_block->node());
-        m_block->document().enqueueAnimationFrameEvent(event.release());
-    }
-
-private:
-    const LayoutBlock* m_block;
-    bool m_shouldDispatchEvent;
-    bool m_hadHorizontalLayoutOverflow;
-    bool m_hadVerticalLayoutOverflow;
-};
-
 LayoutBlock::LayoutBlock(ContainerNode* node)
     : LayoutBox(node)
     , m_hasMarginBeforeQuirk(false)
     , m_hasMarginAfterQuirk(false)
     , m_beingDestroyed(false)
     , m_hasMarkupTruncation(false)
     , m_widthAvailableToChildrenChanged(false)
     , m_hasOnlySelfCollapsingChildren(false)
     , m_descendantsWithFloatsMarkedForLayout(false)
 {
@@ skipping 735 matching lines @@
         if (gDelayUpdateScrollInfo)
             gDelayedUpdateScrollInfoSet->add(this);
         else
             layer()->scrollableArea()->updateAfterLayout();
     }
 }
 
 void LayoutBlock::layout()
 {
     LayoutAnalyzer::Scope analyzer(*this);
-    OverflowEventDispatcher dispatcher(this);
 
     // Table cells call layoutBlock directly, so don't add any logic here.  Put code into
     // layoutBlock().
     layoutBlock(false);
 
     // It's safe to check for control clip here, since controls can never be table cells.
     // If we have a lightweight clip, there can never be any overflow from children.
     if (hasControlClip() && m_overflow)
         clearLayoutOverflow();
 
@@ skipping 2025 matching lines @@
 void LayoutBlock::showLineTreeAndMark(const InlineBox* markedBox1, const char* markedLabel1, const InlineBox* markedBox2, const char* markedLabel2, const LayoutObject* obj) const
 {
     showLayoutObject();
     for (const RootInlineBox* root = firstRootBox(); root; root = root->nextRootBox())
         root->showLineTreeAndMark(markedBox1, markedLabel1, markedBox2, markedLabel2, obj, 1);
 }
 
 #endif
 
 } // namespace blink