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

Say you have class A and subclass B.

Previously it was required to PassAs() a scoped_ptr<B> into a
scoped_ptr<A>. This is no longer needed, so just use Pass(). For newly
created scoped_ptrs, you can just use make_scoped_ptr always now.

And when you want to return or assign an empty scoped_ptr(), you can
now use nullptr directly.

Also adds PRESUBMIT checks for:
- return scoped<T>(foo). This should be return make_scoped_ptr(foo).
- bar = scoped<T>(foo). This should be return bar = make_scoped_ptr(foo).
- return scoped<T>(). This should be return nullptr.
- bar = scoped<T>(). This should be return bar = nullptr.

This also replaces p.reset() with p = nullptr; But it does not add a
PRESUBMIT check for that because there are things other than scoped_ptr
with a reset() function.

R=enne@chromium.org

Review URL: https://codereview.chromium.org/609663003

Cr-Commit-Position: refs/heads/master@{#297096}

1 files changed, 1 insertions, 1 deletions

diff --git a/cc/layers/ui_resource_layer_impl.cc b/cc/layers/ui_resource_layer_impl.cc
index 98843c6..8a7d3df 100644
--- a/cc/layers/ui_resource_layer_impl.cc
+++ b/cc/layers/ui_resource_layer_impl.cc
@@ -29,7 +29,7 @@ UIResourceLayerImpl::~UIResourceLayerImpl() {}
 
 scoped_ptr<LayerImpl> UIResourceLayerImpl::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
-  return UIResourceLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
+  return UIResourceLayerImpl::Create(tree_impl, id());
 }
 
 void UIResourceLayerImpl::PushPropertiesTo(LayerImpl* layer) {