Revert "Make compositingState explicit (re-land #2 with bogus ASSERT removed)"

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 b91d04a1051f2e6bc6a8837bea0ff71f4421c2e5..2f4d146c96f58e060dcd895fef5d4020709af77c 100644
--- a/Source/core/inspector/InspectorLayerTreeAgent.cpp
+++ b/Source/core/inspector/InspectorLayerTreeAgent.cpp
@@ -204,7 +204,7 @@ void InspectorLayerTreeAgent::getLayers(ErrorString* errorString, const int* nod
 
 void InspectorLayerTreeAgent::buildLayerIdToNodeIdMap(ErrorString* errorString, RenderLayer* root, LayerIdToNodeIdMap& layerIdToNodeIdMap)
 {
-    if (root->compositedLayerMapping()) {
+    if (root->isComposited()) {
         if (Node* node = root->renderer()->generatingNode()) {
             GraphicsLayer* graphicsLayer = root->compositedLayerMapping()->childForSuperlayers();
             layerIdToNodeIdMap.set(graphicsLayer->platformLayer()->id(), idForNode(errorString, node));