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

chrome/common/extensions/manifest_tests/extension_manifests_auth_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_manifest_constants.h"
+#include "extensions/common/install_warning.h"
 #include "testing/gtest/include/gtest/gtest.h"
-#include "chrome/common/extensions/extension_manifest_constants.h"
 
 namespace keys = extension_manifest_keys;
 
 TEST_F(ExtensionManifestTest, OAuth2SectionParsing) {
   DictionaryValue base_manifest;
 
   base_manifest.SetString(keys::kName, "test");
   base_manifest.SetString(keys::kVersion, "0.1");
   base_manifest.SetInteger(keys::kManifestVersion, 2);
   base_manifest.SetString(keys::kOAuth2ClientId, "client1");
@@ skipping 38 matching lines @@
   // OAuth2 section should NOT be parsed for a hosted app.
   {
     DictionaryValue app_manifest;
     app_manifest.SetString(keys::kLaunchWebURL, "http://www.google.com");
     app_manifest.MergeDictionary(&base_manifest);
 
     Manifest manifest(&app_manifest, "test");
     scoped_refptr<extensions::Extension> extension =
         LoadAndExpectSuccess(manifest);
     EXPECT_EQ(1U, extension->install_warnings().size());
-    const extensions::Extension::InstallWarning& warning =
+    const extensions::InstallWarning& warning =
         extension->install_warnings()[0];
     EXPECT_EQ("'oauth2' is only allowed for extensions, legacy packaged apps "
                   "and packaged apps, and this is a hosted app.",
               warning.message);
     EXPECT_EQ("", extension->oauth2_info().client_id);
     EXPECT_TRUE(extension->oauth2_info().scopes.empty());
   }
 }