Fix namespace for src/ui/display/.

ui/ozone/platform/headless/ozone_platform_headless.cc

Index: ui/ozone/platform/headless/ozone_platform_headless.cc
diff --git a/ui/ozone/platform/headless/ozone_platform_headless.cc b/ui/ozone/platform/headless/ozone_platform_headless.cc
index d90283ed50b1515e0919455bce78b034bdf9b22e..e7a087eaf20e9131f95f253724ef0f64f25a46a5 100644
--- a/ui/ozone/platform/headless/ozone_platform_headless.cc
+++ b/ui/ozone/platform/headless/ozone_platform_headless.cc
@@ -72,7 +72,7 @@ class OzonePlatformHeadless : public OzonePlatform {
     return base::WrapUnique<PlatformWindow>(
         new HeadlessWindow(delegate, window_manager_.get(), bounds));
   }
-  std::unique_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate()
+  std::unique_ptr<display::NativeDisplayDelegate> CreateNativeDisplayDelegate()
       override {
     return base::MakeUnique<display::FakeDisplayDelegate>();
   }