Move Extension Location and Type enums to Manifest, and move InstallWarning to its own file.

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 "testing/gtest/include/gtest/gtest.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 using extensions::Extension;
@@ skipping 27 matching lines @@
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(test_data); ++i) {
     int create_flags = Extension::NO_FLAGS;
     if (test_data[i].require_modern_manifest_version)
       create_flags |= Extension::REQUIRE_MODERN_MANIFEST_VERSION;
     if (test_data[i].expect_error) {
         LoadAndExpectError(
             Manifest(test_data[i].manifest,
                      test_data[i].test_name),
             errors::kInvalidManifestVersionOld,
-            Extension::LOAD,
+            extensions::Manifest::LOAD,
             create_flags);
     } else {
       LoadAndExpectSuccess(Manifest(test_data[i].manifest,
                                     test_data[i].test_name),
-                           Extension::LOAD,
+                           extensions::Manifest::LOAD,
                            create_flags);
     }
   }
 }