Delete background tab IOSurfaces on Mac.

content/browser/renderer_host/render_widget_host_view_win.cc

Index: content/browser/renderer_host/render_widget_host_view_win.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_win.cc b/content/browser/renderer_host/render_widget_host_view_win.cc
index fd3954c66732620fca193a96320c25083984e760..daf8ac4ce38badcc618a04f55b4ff3221d41ec3a 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.cc
+++ b/content/browser/renderer_host/render_widget_host_view_win.cc
@@ -2250,6 +2250,14 @@ void RenderWidgetHostViewWin::AcceleratedSurfaceSuspend() {
     accelerated_surface_->Suspend();
 }
 
+bool RenderWidgetHostViewWin::HasAcceleratedSurface(
+      const gfx::Size& desired_size) {
+  // TODO(jbates) Implement this so this view can use GetBackingStore for both
+  // software and GPU frames. Defaulting to false just makes GetBackingStore
+  // only useable for software frames.
+  return false;
+}
+
 void RenderWidgetHostViewWin::SetAccessibilityFocus(int acc_obj_id) {
   if (!render_widget_host_)
     return;