Simplify calls for scale factor

content/browser/renderer_host/render_widget_host_view_mac.mm

Index: content/browser/renderer_host/render_widget_host_view_mac.mm
diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index b7b6e741b5555a87b1855b7694a229053d5fa045..aa63c418fd9c0a3017485c409b04e8bd468e728c 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -75,7 +75,6 @@
 #include "ui/base/cocoa/cocoa_base_utils.h"
 #import "ui/base/cocoa/fullscreen_window_manager.h"
 #import "ui/base/cocoa/underlay_opengl_hosting_window.h"
-#include "ui/base/layout.h"
 #include "ui/compositor/compositor.h"
 #include "ui/compositor/layer.h"
 #include "ui/display/display.h"
@@ -689,10 +688,6 @@ int RenderWidgetHostViewMac::window_number() const {
   return [window windowNumber];
 }
 
-float RenderWidgetHostViewMac::ViewScaleFactor() const {
-  return ui::GetScaleFactorForNativeView(cocoa_view_);
-}
-
 void RenderWidgetHostViewMac::UpdateDisplayLink() {
   static bool is_vsync_disabled =
       base::CommandLine::ForCurrentProcess()->HasSwitch(