Change namespace from ui to gfx for NativePixmap related code

ui/ozone/common/stub_client_native_pixmap_factory.cc

Index: ui/ozone/common/stub_client_native_pixmap_factory.cc
diff --git a/ui/ozone/common/stub_client_native_pixmap_factory.cc b/ui/ozone/common/stub_client_native_pixmap_factory.cc
index a1f032f198da240023e5159d422173fd5daeb405..93e596316662043041c34d2ed9065c8b602aa046 100644
--- a/ui/ozone/common/stub_client_native_pixmap_factory.cc
+++ b/ui/ozone/common/stub_client_native_pixmap_factory.cc
@@ -9,7 +9,7 @@ namespace ui {
 
 namespace {
 
-class StubClientNativePixmapFactory : public ClientNativePixmapFactory {
+class StubClientNativePixmapFactory : public gfx::ClientNativePixmapFactory {
  public:
   StubClientNativePixmapFactory() {}
   ~StubClientNativePixmapFactory() override {}
@@ -19,7 +19,7 @@ class StubClientNativePixmapFactory : public ClientNativePixmapFactory {
                                 gfx::BufferUsage usage) const override {
     return false;
   }
-  std::unique_ptr<ClientNativePixmap> ImportFromHandle(
+  std::unique_ptr<gfx::ClientNativePixmap> ImportFromHandle(
       const gfx::NativePixmapHandle& handle,
       const gfx::Size& size,
       gfx::BufferUsage usage) override {
@@ -33,7 +33,7 @@ class StubClientNativePixmapFactory : public ClientNativePixmapFactory {
 
 }  // namespace
 
-ClientNativePixmapFactory* CreateStubClientNativePixmapFactory() {
+gfx::ClientNativePixmapFactory* CreateStubClientNativePixmapFactory() {
   return new StubClientNativePixmapFactory;
 }