[Extensions] Remove the Infobar API

chrome/browser/infobars/infobar_extension_api.h

Index: chrome/browser/infobars/infobar_extension_api.h
diff --git a/chrome/browser/infobars/infobar_extension_api.h b/chrome/browser/infobars/infobar_extension_api.h
deleted file mode 100644
index fd8ac68a9dbf169294bad550ef686107fc0932e7..0000000000000000000000000000000000000000
--- a/chrome/browser/infobars/infobar_extension_api.h
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) 2011 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_BROWSER_INFOBARS_INFOBAR_EXTENSION_API_H_
-#define CHROME_BROWSER_INFOBARS_INFOBAR_EXTENSION_API_H_
-
-#include "chrome/browser/extensions/chrome_extension_function.h"
-
-class InfobarsShowFunction : public ChromeSyncExtensionFunction {
-  ~InfobarsShowFunction() override {}
-  bool RunSync() override;
-  DECLARE_EXTENSION_FUNCTION("infobars.show", INFOBARS_SHOW)
-};
-
-#endif  // CHROME_BROWSER_INFOBARS_INFOBAR_EXTENSION_API_H_