Use a boolean hasCompositedLayerMapping() accessor instead of the pointer

Source/core/rendering/RenderLayerRepainter.cpp

Index: Source/core/rendering/RenderLayerRepainter.cpp
diff --git a/Source/core/rendering/RenderLayerRepainter.cpp b/Source/core/rendering/RenderLayerRepainter.cpp
index 595431fa03737e99e3ad08967d41ad64011efeba..eb65cb6db4750e68ca047ed71d729f1db3b805c7 100644
--- a/Source/core/rendering/RenderLayerRepainter.cpp
+++ b/Source/core/rendering/RenderLayerRepainter.cpp
@@ -135,7 +135,7 @@ void RenderLayerRepainter::repaintIncludingNonCompositingDescendants(RenderLayer
     m_renderer->repaintUsingContainer(repaintContainer, pixelSnappedIntRect(m_renderer->clippedOverflowRectForRepaint(repaintContainer)));
 
     for (RenderLayer* curr = m_renderer->layer()->firstChild(); curr; curr = curr->nextSibling()) {
-        if (!curr->compositedLayerMapping())
+        if (!curr->hasCompositedLayerMapping())
             curr->repainter().repaintIncludingNonCompositingDescendants(repaintContainer);
     }
 }
@@ -145,7 +145,7 @@ LayoutRect RenderLayerRepainter::repaintRectIncludingNonCompositingDescendants()
     LayoutRect repaintRect = m_repaintRect;
     for (RenderLayer* child = m_renderer->layer()->firstChild(); child; child = child->nextSibling()) {
         // Don't include repaint rects for composited child layers; they will paint themselves and have a different origin.
-        if (child->compositedLayerMapping())
+        if (child->hasCompositedLayerMapping())
             continue;
 
         repaintRect.unite(child->repainter().repaintRectIncludingNonCompositingDescendants());
@@ -155,7 +155,7 @@ LayoutRect RenderLayerRepainter::repaintRectIncludingNonCompositingDescendants()
 
 void RenderLayerRepainter::setBackingNeedsRepaint()
 {
-    ASSERT(m_renderer->compositedLayerMapping());
+    ASSERT(m_renderer->hasCompositedLayerMapping());
     m_renderer->compositedLayerMapping()->setContentsNeedDisplay();
 }
 
@@ -163,8 +163,8 @@ void RenderLayerRepainter::setBackingNeedsRepaintInRect(const LayoutRect& r)
 {
     // https://bugs.webkit.org/show_bug.cgi?id=61159 describes an unreproducible crash here,
     // so assert but check that the layer is composited.
-    ASSERT(m_renderer->compositedLayerMapping());
-    if (!m_renderer->compositedLayerMapping()) {
+    ASSERT(m_renderer->hasCompositedLayerMapping());
+    if (!m_renderer->hasCompositedLayerMapping()) {
         // If we're trying to repaint the placeholder document layer, propagate the
         // repaint to the native view system.
         LayoutRect absRect(r);
@@ -212,7 +212,7 @@ void RenderLayerRepainter::setFilterBackendNeedsRepaintingInRect(const LayoutRec
     FloatQuad repaintQuad(rectForRepaint);
     LayoutRect parentLayerRect = m_renderer->localToContainerQuad(repaintQuad, parentLayer->renderer()).enclosingBoundingBox();
 
-    if (parentLayer->compositedLayerMapping()) {
+    if (parentLayer->hasCompositedLayerMapping()) {
         parentLayer->repainter().setBackingNeedsRepaintInRect(parentLayerRect);
         return;
     }