Clang style plugin: remove 'warn-only' option

tools/clang/plugins/tests/warn_only.h

Index: tools/clang/plugins/tests/warn_only.h
diff --git a/tools/clang/plugins/tests/warn_only.h b/tools/clang/plugins/tests/warn_only.h
deleted file mode 100644
index fcc0aa1dba2b7a19a15098ae41a9a3c2067555da..0000000000000000000000000000000000000000
--- a/tools/clang/plugins/tests/warn_only.h
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright (c) 2015 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 WARN_ONLY_H_
-#define WARN_ONLY_H_
-
-#include <string>
-#include <vector>
-
-class InlineCtors {
- public:
-  InlineCtors() {}
-  ~InlineCtors() {}
-
- private:
-  std::vector<int> one_;
-  std::vector<std::string> two_;
-};
-
-#endif  // WARN_ONLY_H_