Fix namespace for src/ui/display/.

ui/ozone/common/display_mode_proxy.h

Index: ui/ozone/common/display_mode_proxy.h
diff --git a/ui/ozone/common/display_mode_proxy.h b/ui/ozone/common/display_mode_proxy.h
index 3701942a8fa45a6b970fbaba8b240c32caaf49f1..97dfd1bf5adaa9eb64dce591fb45022d943f27d5 100644
--- a/ui/ozone/common/display_mode_proxy.h
+++ b/ui/ozone/common/display_mode_proxy.h
@@ -12,11 +12,11 @@ namespace ui {
 
 struct DisplayMode_Params;
 
-class DisplayModeProxy : public DisplayMode {
+class DisplayModeProxy : public display::DisplayMode {
  public:
   explicit DisplayModeProxy(const DisplayMode_Params& params);
   ~DisplayModeProxy() override;
-  std::unique_ptr<DisplayMode> Clone() const override;
+  std::unique_ptr<display::DisplayMode> Clone() const override;
 
  private:
   DisplayModeProxy(const gfx::Size& size, bool interlaced, float refresh_rate);