Delete Ozone egltest platform.

ui/ozone/ozone.gni

Index: ui/ozone/ozone.gni
diff --git a/ui/ozone/ozone.gni b/ui/ozone/ozone.gni
index 768ddf74a93f9f8603baba98edbaea6c45099b78..e4b6ef9a27040e68ca9d7ecf02ce696e40b4d4b0 100644
--- a/ui/ozone/ozone.gni
+++ b/ui/ozone/ozone.gni
@@ -24,9 +24,7 @@ declare_args() {
   # Enable individual platforms.
   ozone_platform_caca = false
   ozone_platform_cast = false
-  ozone_platform_egltest = false
   ozone_platform_gbm = false
-  ozone_platform_ozonex = false
   ozone_platform_headless = false
   ozone_platform_x11 = false
   ozone_platform_wayland = false
@@ -61,6 +59,6 @@ declare_args() {
 }
 
 assert(use_ozone || !(ozone_platform_caca || ozone_platform_cast ||
-                          ozone_platform_egltest || ozone_platform_gbm ||
-                          ozone_platform_ozonex || ozone_platform_headless),
+                          ozone_platform_gbm || ozone_platform_headless ||
+                          ozone_platform_x11 || ozone_platform_wayland),
        "Must set use_ozone to select ozone platforms")