content: A couple of device-scale-factor fixes:

content/renderer/render_widget.cc

Index: content/renderer/render_widget.cc
diff --git a/content/renderer/render_widget.cc b/content/renderer/render_widget.cc
index 8d99759a93a70c8137214febf78db18d0052639f..feed4441d09f843e57af81ba9fce91fe08584971 100644
--- a/content/renderer/render_widget.cc
+++ b/content/renderer/render_widget.cc
@@ -1676,6 +1676,10 @@ WebScreenInfo RenderWidget::screenInfo() {
   return screen_info_;
 }
 
+float RenderWidget::deviceScaleFactor() {
+  return device_scale_factor_;
+}
+
 void RenderWidget::resetInputMethod() {
   if (!input_method_is_active_)
     return;