Set relayoutChildren to 'true' only if size change happens in Table

Source/core/inspector/InspectorLayerTreeAgent.cpp

Index: Source/core/inspector/InspectorLayerTreeAgent.cpp
diff --git a/Source/core/inspector/InspectorLayerTreeAgent.cpp b/Source/core/inspector/InspectorLayerTreeAgent.cpp
index acdea584135b631a58662e8c9cf400672f280fee..846e784d29c8e02a1111c95666d4bc7a8c75c1f0 100644
--- a/Source/core/inspector/InspectorLayerTreeAgent.cpp
+++ b/Source/core/inspector/InspectorLayerTreeAgent.cpp
@@ -229,9 +229,9 @@ PassRefPtr<TypeBuilder::Array<TypeBuilder::LayerTree::Layer> > InspectorLayerTre
 
 void InspectorLayerTreeAgent::buildLayerIdToNodeIdMap(RenderLayer* root, LayerIdToNodeIdMap& layerIdToNodeIdMap)
 {
-    if (root->hasCompositedLayerMapping()) {
+    if (CompositedLayerMapping* compositedLayerMapping = root->compositedLayerMapping()) {
         if (Node* node = root->renderer()->generatingNode()) {
-            GraphicsLayer* graphicsLayer = root->compositedLayerMapping()->childForSuperlayers();
+            GraphicsLayer* graphicsLayer = compositedLayerMapping->childForSuperlayers();
             layerIdToNodeIdMap.set(graphicsLayer->platformLayer()->id(), idForNode(node));
         }
     }