tracing: Make ConvertableToTraceFormat move-only scoped_ptr

cc/layers/layer_client.h

Index: cc/layers/layer_client.h
diff --git a/cc/layers/layer_client.h b/cc/layers/layer_client.h
index 524399d0d84e5e72379b80338c87dbc1213e4c16..fa33f92b13247b22b2deb1f52156bd077d1a878d 100644
--- a/cc/layers/layer_client.h
+++ b/cc/layers/layer_client.h
@@ -5,7 +5,7 @@
 #ifndef CC_LAYERS_LAYER_CLIENT_H_
 #define CC_LAYERS_LAYER_CLIENT_H_
 
-#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 
 namespace base {
@@ -27,8 +27,8 @@ class CC_EXPORT LayerClient {
   //
   // A pointer to the layer is provided for the convenience of layer clients
   // which service multiple layers.
-  virtual scoped_refptr<base::trace_event::ConvertableToTraceFormat>
-  TakeDebugInfo(Layer* layer) = 0;
+  virtual scoped_ptr<base::trace_event::ConvertableToTraceFormat> TakeDebugInfo(
+      Layer* layer) = 0;
 
  protected:
   virtual ~LayerClient() {}