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

cc/trees/occlusion_tracker_perftest.cc

Index: cc/trees/occlusion_tracker_perftest.cc
diff --git a/cc/trees/occlusion_tracker_perftest.cc b/cc/trees/occlusion_tracker_perftest.cc
index 7e4a8f8bca73e5a6a5b68b6a2c7f383d3da4de88..b7ecf3b6a22e281383496ee9a8138d58e9e86355 100644
--- a/cc/trees/occlusion_tracker_perftest.cc
+++ b/cc/trees/occlusion_tracker_perftest.cc
@@ -46,7 +46,7 @@ class OcclusionTrackerPerfTest : public testing::Test {
 
     scoped_ptr<LayerImpl> root_layer = LayerImpl::Create(active_tree(), 1);
     root_layer->SetHasRenderSurface(true);
-    active_tree()->SetRootLayer(root_layer.Pass());
+    active_tree()->SetRootLayer(std::move(root_layer));
   }
 
   LayerTreeImpl* active_tree() { return host_impl_->active_tree(); }
@@ -90,7 +90,7 @@ TEST_F(OcclusionTrackerPerfTest, UnoccludedContentRect_FullyOccluded) {
   opaque_layer->SetContentsOpaque(true);
   opaque_layer->SetDrawsContent(true);
   opaque_layer->SetBounds(viewport_rect.size());
-  active_tree()->root_layer()->AddChild(opaque_layer.Pass());
+  active_tree()->root_layer()->AddChild(std::move(opaque_layer));
 
   bool update_lcd_text = false;
   active_tree()->UpdateDrawProperties(update_lcd_text);
@@ -159,7 +159,7 @@ TEST_F(OcclusionTrackerPerfTest, UnoccludedContentRect_10OpaqueLayers) {
     opaque_layer->SetBounds(
         gfx::Size(viewport_rect.width() / 2, viewport_rect.height() / 2));
     opaque_layer->SetPosition(gfx::PointF(i, i));
-    active_tree()->root_layer()->AddChild(opaque_layer.Pass());
+    active_tree()->root_layer()->AddChild(std::move(opaque_layer));
   }
 
   bool update_lcd_text = false;