Move the rest of extension_manifest_constants to top-level extensions/

chrome/common/extensions/manifest_tests/extension_manifests_manifest_version_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 "extensions/common/manifest_constants.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 using extensions::Extension;
 
-namespace errors = extension_manifest_errors;
+namespace errors = extensions::manifest_errors;
 
 TEST_F(ExtensionManifestTest, ManifestVersionError) {
   scoped_ptr<base::DictionaryValue> manifest1(new base::DictionaryValue());
   manifest1->SetString("name", "Miles");
   manifest1->SetString("version", "0.55");
 
   scoped_ptr<base::DictionaryValue> manifest2(manifest1->DeepCopy());
   manifest2->SetInteger("manifest_version", 1);
 
   scoped_ptr<base::DictionaryValue> manifest3(manifest1->DeepCopy());
@@ skipping 25 matching lines @@
             extensions::Manifest::UNPACKED,
             create_flags);
     } else {
       LoadAndExpectSuccess(Manifest(test_data[i].manifest,
                                     test_data[i].test_name),
                            extensions::Manifest::UNPACKED,
                            create_flags);
     }
   }
 }