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

Committed: https://crrev.com/7bb3dbede19d87f0338797756ffd738adc6bca08
Cr-Commit-Position: refs/heads/master@{#297096}

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

Cr-Commit-Position: refs/heads/master@{#297121}

1 files changed, 1 insertions, 1 deletions

diff --git a/cc/layers/video_layer.cc b/cc/layers/video_layer.cc
index 995668b..fe37fbf4 100644
--- a/cc/layers/video_layer.cc
+++ b/cc/layers/video_layer.cc
@@ -25,7 +25,7 @@ VideoLayer::~VideoLayer() {}
 scoped_ptr<LayerImpl> VideoLayer::CreateLayerImpl(LayerTreeImpl* tree_impl) {
   scoped_ptr<VideoLayerImpl> impl =
       VideoLayerImpl::Create(tree_impl, id(), provider_, video_rotation_);
-  return impl.PassAs<LayerImpl>();
+  return impl.Pass();
 }
 
 bool VideoLayer::Update(ResourceUpdateQueue* queue,