Rename "test" ozone platform to "headless"

ui/ozone/platform/headless/client_native_pixmap_factory_headless.cc

Index: ui/ozone/platform/headless/client_native_pixmap_factory_headless.cc
diff --git a/ui/ozone/platform/caca/client_native_pixmap_factory_caca.cc b/ui/ozone/platform/headless/client_native_pixmap_factory_headless.cc
similarity index 68%
copy from ui/ozone/platform/caca/client_native_pixmap_factory_caca.cc
copy to ui/ozone/platform/headless/client_native_pixmap_factory_headless.cc
index ffea4474ff4e8f7cf33115b6740c5ee17bd4702e..1f409eb013ff38efdc3d4b9d651e0e3d27e6a01d 100644
--- a/ui/ozone/platform/caca/client_native_pixmap_factory_caca.cc
+++ b/ui/ozone/platform/headless/client_native_pixmap_factory_headless.cc
@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/ozone/platform/caca/client_native_pixmap_factory_caca.h"
+#include "ui/ozone/platform/headless/client_native_pixmap_factory_headless.h"
 
 #include "ui/ozone/common/stub_client_native_pixmap_factory.h"
 
 namespace ui {
 
-ClientNativePixmapFactory* CreateClientNativePixmapFactoryCaca() {
+ClientNativePixmapFactory* CreateClientNativePixmapFactoryHeadless() {
   return CreateStubClientNativePixmapFactory();
 }