cc: Remove use of PassAs() and constructor-casting with scoped_ptr.

cc/test/fake_content_layer.cc

Index: cc/test/fake_content_layer.cc
diff --git a/cc/test/fake_content_layer.cc b/cc/test/fake_content_layer.cc
index 87accc785a745b69f880d8c62b9f92f914d80205..4025afda373880d83090f98dab362fa811c4ab59 100644
--- a/cc/test/fake_content_layer.cc
+++ b/cc/test/fake_content_layer.cc
@@ -32,7 +32,7 @@ FakeContentLayer::~FakeContentLayer() {}
 
 scoped_ptr<LayerImpl> FakeContentLayer::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
-  return FakeContentLayerImpl::Create(tree_impl, layer_id_).PassAs<LayerImpl>();
+  return FakeContentLayerImpl::Create(tree_impl, layer_id_);
 }
 
 bool FakeContentLayer::Update(ResourceUpdateQueue* queue,