Remove tools/clang (this will break things temporarily).

tools/clang/plugins/tests/system/windows.h

Index: tools/clang/plugins/tests/system/windows.h
diff --git a/tools/clang/plugins/tests/system/windows.h b/tools/clang/plugins/tests/system/windows.h
deleted file mode 100644
index 98cc307c27957337bf03fe3ba9310b5039a70cba..0000000000000000000000000000000000000000
--- a/tools/clang/plugins/tests/system/windows.h
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 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 TOOLS_CLANG_PLUGINS_TESTS_SYSTEM_WINDOWS_H_
-#define TOOLS_CLANG_PLUGINS_TESTS_SYSTEM_WINDOWS_H_
-
-#define STDMETHOD(x) virtual void x
-
-#define END_COM_MAP() virtual void AddRef() = 0;
-
-#define SYSTEM_REDUNDANT1 virtual void NonVirtualFinal() final
-#define SYSTEM_REDUNDANT2 virtual void Virtual() override final
-
-#define SYSTEM_INLINE_VIRTUAL virtual int Foo() { return 4; }
-
-#endif  // TOOLS_CLANG_PLUGINS_TESTS_SYSTEM_WINDOWS_H_