ozone: Fix the way platform tests link ozone

ui/ozone/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")
 import("//ui/ozone/ozone.gni")
 import("//testing/test.gni")
 
 assert(use_ozone)
 
@@ skipping 104 matching lines @@
     "//ui/display/types",
     "//ui/display/util",
     "//ui/events",
     "//ui/events:dom_keycode_converter",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gfx/ipc",
   ]
 }
 
-component("ozone") {
+source_set("platform") {
   sources = [
     "common/stub_client_native_pixmap_factory.cc",
     "common/stub_client_native_pixmap_factory.h",
     "platform_selection.cc",
     "platform_selection.h",
     "public/client_native_pixmap_factory.cc",
     "public/client_native_pixmap_factory.h",
     "public/ozone_gpu_test_helper.cc",
     "public/ozone_gpu_test_helper.h",
     "public/ozone_platform.cc",
@@ skipping 18 matching lines @@
     "//ui/platform_window",
   ]
 
   deps = [
     ":generate_constructor_list",
     ":generate_ozone_platform_list",
   ]
 
   # TODO(GYP) the GYP version has a way to add additional dependencies via
   # build flags.
-  public_deps += ozone_platform_deps
+  deps += ozone_platform_deps
 
   # Platforms are always linked into //ui/ozone and can include our headers.
   allow_circular_includes_from = ozone_platform_deps
 }
 
+component("ozone") {
+  public_deps = [
+    ":platform",
+  ]
+}
+
 # GYP version: ui/ozone/ozone.gyp:generate_ozone_platform_list
 action("generate_ozone_platform_list") {
   script = "generate_ozone_platform_list.py"
   outputs = [
     platform_list_cc_file,
     platform_list_h_file,
     platform_list_txt_file,
   ]
 
   args =
@@ skipping 30 matching lines @@
     ":generate_ozone_platform_list",
   ]
 }
 
 test("ozone_unittests") {
   sources = [
     "run_all_unittests.cc",
   ]
 
   deps = [
-           "//base/test:test_support",
-           "//testing/gtest",
-           "//ui/gfx/geometry",
-         ] + ozone_platform_test_deps
+    "//base/test:test_support",
+    "//testing/gtest",
+    "//ui/gfx/geometry",
+  ]
+
+  # Add tests of platform internals.
+  deps += ozone_platform_test_deps
+
+  # Platform tests link ozone statically. Make sure we're not getting a
+  # 2nd copy of any code via the component.
+  assert_no_deps = [ "//ui/ozone" ]
 }