Move extensions manifest handler for OAuth2 to //extensions

extensions/common/manifest_handlers/oauth2_manifest_handler.h

 // Copyright (c) 2013 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.
 
-#ifndef CHROME_COMMON_EXTENSIONS_API_IDENTITY_OAUTH2_MANIFEST_HANDLER_H_
-#define CHROME_COMMON_EXTENSIONS_API_IDENTITY_OAUTH2_MANIFEST_HANDLER_H_
+#ifndef EXTENSIONS_COMMON_MANIFEST_HANDLERS_OAUTH2_MANIFEST_HANDLER_H_
+#define EXTENSIONS_COMMON_MANIFEST_HANDLERS_OAUTH2_MANIFEST_HANDLER_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest_handler.h"
 
 namespace extensions {
 
@@ skipping 21 matching lines @@
                      base::string16* error) override;
 
  private:
   virtual const std::vector<std::string> Keys() const override;
 
   DISALLOW_COPY_AND_ASSIGN(OAuth2ManifestHandler);
 };
 
 }  // namespace extensions
 
-#endif  // CHROME_COMMON_EXTENSIONS_API_IDENTITY_OAUTH2_MANIFEST_HANDLER_H_
+#endif  // EXTENSIONS_COMMON_MANIFEST_HANDLERS_OAUTH2_MANIFEST_HANDLER_H_