Use C++11 range-based loop for core/layout

Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp

Index: Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp
diff --git a/Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp b/Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp
index 84765cf1a0e60613baede817a927953762f1b214..a950da2e61a0f866a13d2c34965163e2480c0ed8 100644
--- a/Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp
+++ b/Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp
@@ -352,8 +352,8 @@ void DeprecatedPaintLayerCompositor::updateIfNeeded()
         {
             TRACE_EVENT0("blink", "DeprecatedPaintLayerCompositor::updateAfterCompositingChange");
             if (const FrameView::ScrollableAreaSet* scrollableAreas = m_layoutView.frameView()->scrollableAreas()) {
-                for (FrameView::ScrollableAreaSet::iterator it = scrollableAreas->begin(); it != scrollableAreas->end(); ++it)
-                    layersChanged |= (*it)->updateAfterCompositingChange();
+                for (auto* scrollableArea : *scrollableAreas)
+                    layersChanged |= scrollableArea->updateAfterCompositingChange();
             }
         }