tracing: Make ConvertableToTraceFormat move-only scoped_ptr

android_webview/browser/browser_view_renderer.cc

Index: android_webview/browser/browser_view_renderer.cc
diff --git a/android_webview/browser/browser_view_renderer.cc b/android_webview/browser/browser_view_renderer.cc
index c9a3e8a8da11293d78a7d451998407267e4dfff6..6f66169245571fcb6057390dae14eb722cc2c75c 100644
--- a/android_webview/browser/browser_view_renderer.cc
+++ b/android_webview/browser/browser_view_renderer.cc
@@ -658,12 +658,11 @@ void BrowserViewRenderer::UpdateRootLayerState(
   SetTotalRootLayerScrollOffset(total_scroll_offset_dip);
 }
 
-scoped_refptr<base::trace_event::ConvertableToTraceFormat>
+scoped_ptr<base::trace_event::ConvertableToTraceFormat>
 BrowserViewRenderer::RootLayerStateAsValue(
     const gfx::Vector2dF& total_scroll_offset_dip,
     const gfx::SizeF& scrollable_size_dip) {
-  scoped_refptr<base::trace_event::TracedValue> state =
-      new base::trace_event::TracedValue();
+  auto state = make_scoped_ptr(new base::trace_event::TracedValue());
 
   state->SetDouble("total_scroll_offset_dip.x", total_scroll_offset_dip.x());
   state->SetDouble("total_scroll_offset_dip.y", total_scroll_offset_dip.y());
@@ -675,7 +674,7 @@ BrowserViewRenderer::RootLayerStateAsValue(
   state->SetDouble("scrollable_size_dip.height", scrollable_size_dip.height());
 
   state->SetDouble("page_scale_factor", page_scale_factor_);
-  return state;
+  return std::move(state);
 }
 
 void BrowserViewRenderer::DidOverscroll(