Change FrameTree to return Frames instead of LocalFrames.

Source/core/rendering/compositing/RenderLayerCompositor.cpp

Index: Source/core/rendering/compositing/RenderLayerCompositor.cpp
diff --git a/Source/core/rendering/compositing/RenderLayerCompositor.cpp b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
index a620ac9c5f3a3d4138dd39f396334ffee3e458f0..f98557379d5e86849a098ed79fb73bc1fee608e9 100644
--- a/Source/core/rendering/compositing/RenderLayerCompositor.cpp
+++ b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
@@ -252,8 +252,10 @@ static RenderVideo* findFullscreenVideoRenderer(Document& document)
 
 void RenderLayerCompositor::updateIfNeededRecursive()
 {
-    for (LocalFrame* child = m_renderView.frameView()->frame().tree().firstChild(); child; child = child->tree().nextSibling())
-        child->contentRenderer()->compositor()->updateIfNeededRecursive();
+    for (Frame* child = m_renderView.frameView()->frame().tree().firstChild(); child; child = child->tree().nextSibling()) {
+        if (child->isLocalFrame())
+            toLocalFrame(child)->contentRenderer()->compositor()->updateIfNeededRecursive();
+    }
 
     TRACE_EVENT0("blink_rendering", "RenderLayerCompositor::updateIfNeededRecursive");
 
@@ -273,8 +275,10 @@ void RenderLayerCompositor::updateIfNeededRecursive()
 
 #if ASSERT_ENABLED
     assertNoUnresolvedDirtyBits();
-    for (LocalFrame* child = m_renderView.frameView()->frame().tree().firstChild(); child; child = child->tree().nextSibling())
-        child->contentRenderer()->compositor()->assertNoUnresolvedDirtyBits();
+    for (Frame* child = m_renderView.frameView()->frame().tree().firstChild(); child; child = child->tree().nextSibling()) {
+        if (child->isLocalFrame())
+            toLocalFrame(child)->contentRenderer()->compositor()->assertNoUnresolvedDirtyBits();
+    }
 #endif
 }
 
@@ -1328,10 +1332,12 @@ void RenderLayerCompositor::notifyIFramesOfCompositingChange()
         return;
     LocalFrame& frame = m_renderView.frameView()->frame();
 
-    for (LocalFrame* child = frame.tree().firstChild(); child; child = child->tree().traverseNext(&frame)) {
-        if (!child->document())
+    for (Frame* child = frame.tree().firstChild(); child; child = child->tree().traverseNext(&frame)) {
+        if (!child->isLocalFrame())
+            continue;
+        if (!toLocalFrame(child)->document())
             continue; // FIXME: Can this happen?
-        if (HTMLFrameOwnerElement* ownerElement = child->document()->ownerElement()) {
+        if (HTMLFrameOwnerElement* ownerElement = toLocalFrame(child)->document()->ownerElement()) {
             DeprecatedScheduleStyleRecalcDuringCompositingUpdate marker(ownerElement->document().lifecycle());
             ownerElement->scheduleLayerUpdate();
         }