Delete MaskImageChanged, VideoChanged, and FullScreenChanged

Source/core/rendering/RenderBox.cpp

Index: Source/core/rendering/RenderBox.cpp
diff --git a/Source/core/rendering/RenderBox.cpp b/Source/core/rendering/RenderBox.cpp
index 24dd8225a87137b4aef826dbb5012330150c09c7..449d1344f2414543eaee54fe0ae4278ef7725c45 100644
--- a/Source/core/rendering/RenderBox.cpp
+++ b/Source/core/rendering/RenderBox.cpp
@@ -1484,16 +1484,6 @@ void RenderBox::paintFillLayer(const PaintInfo& paintInfo, const Color& c, const
     paintFillLayerExtended(paintInfo, c, fillLayer, rect, bleedAvoidance, 0, LayoutSize(), op, backgroundObject);
 }
 
-static bool layersUseImage(WrappedImagePtr image, const FillLayer* layers)
-{
-    for (const FillLayer* curLayer = layers; curLayer; curLayer = curLayer->next()) {
-        if (curLayer->image() && image == curLayer->image()->data())
-            return true;
-    }
-
-    return false;
-}
-
 void RenderBox::imageChanged(WrappedImagePtr image, const IntRect*)
 {
     if (!parent())
@@ -1516,9 +1506,6 @@ void RenderBox::imageChanged(WrappedImagePtr image, const IntRect*)
     bool didFullRepaint = repaintLayerRectsForImage(image, style()->backgroundLayers(), true);
     if (!didFullRepaint)
         repaintLayerRectsForImage(image, style()->maskLayers(), false);
-
-    if (hasLayer() && layer()->hasCompositedMask() && layersUseImage(image, style()->maskLayers()))
-        layer()->contentChanged(MaskImageChanged);
 }
 
 bool RenderBox::repaintLayerRectsForImage(WrappedImagePtr image, const FillLayer* layers, bool drawingBackground)