Allow extensions which can run without NPAPI to run under Windows 8 Metro.

chrome/common/extensions/manifest_tests/extension_manifests_requirements_unittest.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/common/extensions/manifest_tests/extension_manifest_test.h"
 
 #include "chrome/common/extensions/extension_error_utils.h"
 #include "chrome/common/extensions/extension_manifest_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 48 matching lines @@
 }
 
 // When an npapi plugin is present, the default of the "npapi" requirement
 // changes.
 TEST_F(ExtensionManifestTest, RequirementsNpapiDefault) {
   scoped_refptr<extensions::Extension> extension(LoadAndExpectSuccess(
       "requirements_npapi_empty.json"));
   ASSERT_TRUE(extension.get());
   EXPECT_EQ(extension->requirements().webgl, false);
   EXPECT_EQ(extension->requirements().css3d, false);
-#if defined(OS_CHROMEOS)
+  EXPECT_EQ(extension->requirements().npapi, true);
+
+  extension = LoadAndExpectSuccess(
+      "requirements_npapi_empty_plugins_empty.json");
+  ASSERT_TRUE(extension.get());
+  EXPECT_EQ(extension->requirements().webgl, false);
+  EXPECT_EQ(extension->requirements().css3d, false);
   EXPECT_EQ(extension->requirements().npapi, false);
-#else
-  EXPECT_EQ(extension->requirements().npapi, true);
-#endif  // defined(OS_CHROMEOS)
 
   extension = LoadAndExpectSuccess("requirements_npapi.json");
   ASSERT_TRUE(extension.get());
   EXPECT_EQ(extension->requirements().webgl, false);
   EXPECT_EQ(extension->requirements().css3d, false);
   EXPECT_EQ(extension->requirements().npapi, false);
+
+  extension = LoadAndExpectSuccess("requirements_npapi_plugins_empty.json");
+  ASSERT_TRUE(extension.get());
+  EXPECT_EQ(extension->requirements().webgl, false);
+  EXPECT_EQ(extension->requirements().css3d, false);
+  EXPECT_EQ(extension->requirements().npapi, true);
 }