Bug 728724 - Backout c210ff20f371, as the correct fix has now landed. r=joe a=blocking-fennec

gfx/layers/ipc/CompositorParent.cpp

@@ -231,23 +231,6 @@ CompositorParent::Composite()
 #endif
 }
 
-// Go down shadow layer tree, setting properties to match their non-shadow
-// counterparts.
-static void
-SetShadowProperties(Layer* aLayer)
-{
-  // FIXME: Bug 717688 -- Do these updates in ShadowLayersParent::RecvUpdate.
-  ShadowLayer* shadow = aLayer->AsShadowLayer();
-  shadow->SetShadowTransform(aLayer->GetTransform());
-  shadow->SetShadowVisibleRegion(aLayer->GetVisibleRegion());
-  shadow->SetShadowClipRect(aLayer->GetClipRect());
-
-  for (Layer* child = aLayer->GetFirstChild();
-      child; child = child->GetNextSibling()) {
-    SetShadowProperties(child);
-  }
-}
-
 #ifdef MOZ_WIDGET_ANDROID
 // Do a breadth-first search to find the first layer in the tree that is
 // scrollable.
@@ -256,21 +239,6 @@ CompositorParent::GetPrimaryScrollableLayer()
 {
   Layer* root = mLayerManager->GetRoot();
 
-  // FIXME: We're currently getting passed layers that are not part of our content, but
-  // we are drawing them anyway. This is causing severe rendering corruption to our background
-  // and checkerboarding. The real fix here is to assert that we don't have any useless layers
-  // and ensure that layout isn't giving us any. This is being tracked in bug 728284.
-  // For now just clip them to the empty rect so we don't draw them.
-  Layer* discardLayer = root->GetFirstChild();
-
-  while (discardLayer) {
-    if (!discardLayer->AsContainerLayer()) {
-      discardLayer->IntersectClipRect(nsIntRect());
-      SetShadowProperties(discardLayer);
-    }
-    discardLayer = discardLayer->GetNextSibling();
-  }
-
   nsTArray<Layer*> queue;
   queue.AppendElement(root);
   while (queue.Length()) {
@@ -296,6 +264,23 @@ CompositorParent::GetPrimaryScrollableLayer()
 }
 #endif
 
+// Go down shadow layer tree, setting properties to match their non-shadow
+// counterparts.
+static void
+SetShadowProperties(Layer* aLayer)
+{
+  // FIXME: Bug 717688 -- Do these updates in ShadowLayersParent::RecvUpdate.
+  ShadowLayer* shadow = aLayer->AsShadowLayer();
+  shadow->SetShadowTransform(aLayer->GetTransform());
+  shadow->SetShadowVisibleRegion(aLayer->GetVisibleRegion());
+  shadow->SetShadowClipRect(aLayer->GetClipRect());
+
+  for (Layer* child = aLayer->GetFirstChild();
+      child; child = child->GetNextSibling()) {
+    SetShadowProperties(child);
+  }
+}
+
 void
 CompositorParent::TransformShadowTree()
 {