Remove unnecessary dependencies.

mojo/converters/ozone_drm_gpu/BUILD.gn

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 source_set("ozone_drm_gpu") {
   sources = [
     "ozone_drm_gpu_type_converters.cc",
     "ozone_drm_gpu_type_converters.h",
   ]
 
   deps = [
     "//base",
-    "//ui/ozone:ozone_common_message_types",
     "//mojo/converters/geometry",
-    "//mojo/environment:chromium",
     "//mojo/public/c/system",
     "//mojo/services/ozone_drm_gpu/interfaces",
+    "//ui/ozone:ozone_common_message_types",
   ]
 }