cc: Replace Pass() with std::move() in some subdirs.

cc/layers/layer_impl.cc

Index: cc/layers/layer_impl.cc
diff --git a/cc/layers/layer_impl.cc b/cc/layers/layer_impl.cc
index e0b7f44738c05d72fb1d1e355c44fe479f8ef14f..38cebf6c1bc15e4dba9e1de64fd74d2bffabe5d9 100644
--- a/cc/layers/layer_impl.cc
+++ b/cc/layers/layer_impl.cc
@@ -127,7 +127,7 @@ LayerImpl::~LayerImpl() {
 void LayerImpl::AddChild(scoped_ptr<LayerImpl> child) {
   child->SetParent(this);
   DCHECK_EQ(layer_tree_impl(), child->layer_tree_impl());
-  children_.push_back(child.Pass());
+  children_.push_back(std::move(child));
   layer_tree_impl()->set_needs_update_draw_properties();
 }
 
@@ -1023,7 +1023,7 @@ void LayerImpl::SetMaskLayer(scoped_ptr<LayerImpl> mask_layer) {
     return;
   }
 
-  mask_layer_ = mask_layer.Pass();
+  mask_layer_ = std::move(mask_layer);
   mask_layer_id_ = new_layer_id;
   if (mask_layer_)
     mask_layer_->SetParent(this);
@@ -1032,7 +1032,7 @@ void LayerImpl::SetMaskLayer(scoped_ptr<LayerImpl> mask_layer) {
 
 scoped_ptr<LayerImpl> LayerImpl::TakeMaskLayer() {
   mask_layer_id_ = -1;
-  return mask_layer_.Pass();
+  return std::move(mask_layer_);
 }
 
 void LayerImpl::SetReplicaLayer(scoped_ptr<LayerImpl> replica_layer) {
@@ -1045,7 +1045,7 @@ void LayerImpl::SetReplicaLayer(scoped_ptr<LayerImpl> replica_layer) {
     return;
   }
 
-  replica_layer_ = replica_layer.Pass();
+  replica_layer_ = std::move(replica_layer);
   replica_layer_id_ = new_layer_id;
   if (replica_layer_)
     replica_layer_->SetParent(this);
@@ -1054,7 +1054,7 @@ void LayerImpl::SetReplicaLayer(scoped_ptr<LayerImpl> replica_layer) {
 
 scoped_ptr<LayerImpl> LayerImpl::TakeReplicaLayer() {
   replica_layer_id_ = -1;
-  return replica_layer_.Pass();
+  return std::move(replica_layer_);
 }
 
 ScrollbarLayerImplBase* LayerImpl::ToScrollbarLayer() {