GN: Get os="chromeos" use_ozone=true to compile

ui/base/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/ui.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
@@ skipping 739 matching lines @@
       "dragdrop/os_exchange_data_provider_aurax11_unittest.cc",
       "models/list_model_unittest.cc",
       "models/list_selection_model_unittest.cc",
       "models/tree_node_model_unittest.cc",
       "test/data/resource.h",
       "text/bytes_formatting_unittest.cc",
       "view_prop_unittest.cc",
       "webui/web_ui_util_unittest.cc",
       "x/selection_requestor_unittest.cc",
     ]
-
-    if (!use_x11) {
-      if (is_chromeos) {
-        # These were already removed in the chromeos case.
-        sources -= [
-          "ime/chromeos/character_composer_unittest.cc",
-          "ime/input_method_chromeos_unittest.cc",
-        ]
-      }
-    }
   }
 
   if (build_ime) {
     sources += [
       "ime/candidate_window_unittest.cc",
       "ime/chromeos/character_composer_unittest.cc",
       "ime/input_method_base_unittest.cc",
       "ime/input_method_chromeos_unittest.cc",
       "ime/remote_input_method_win_unittest.cc",
       "ime/win/imm32_manager_unittest.cc",
       "ime/win/tsf_input_scope_unittest.cc",
     ]
     if (use_x11) {
       sources += [ "ime/composition_text_util_pango_unittest.cc" ]
     }
+    if (!use_x11 && is_chromeos) {
+      # These were already removed in the non-chromeos case.
+      sources -= [
+        "ime/chromeos/character_composer_unittest.cc",
+        "ime/input_method_chromeos_unittest.cc",
+      ]
+    }
   }
 
   deps = [
     "//base",
     "//base/allocator",
     "//base/test:test_support",
     "//net",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
@@ skipping 105 matching lines @@
       "//ui/chromeos/resources",
       "//ui/chromeos/strings",
       "//ui/chromeos:ui_chromeos",
       "//ui/events:gesture_detection",
       "//ui/message_center:message_center",
     ]
   }
 }
 }
 # TODO(GYP) Mac (ui_unittest_bundle) and Android (ui_unittests_apk).