Revert of Add deprecation message for -webkit-background-composite

third_party/WebKit/Source/core/frame/Deprecation.h

-// Copyright 2016 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 Deprecation_h
-#define Deprecation_h
-
-#include "core/CSSPropertyNames.h"
-#include "wtf/BitVector.h"
-#include "wtf/Noncopyable.h"
-
-namespace blink {
-
-class LocalFrame;
-
-class Deprecation {
-    DISALLOW_NEW();
-    WTF_MAKE_NONCOPYABLE(Deprecation);
-public:
-    Deprecation();
-    ~Deprecation();
-
-    static void warnOnDeprecatedProperties(const LocalFrame*, CSSPropertyID unresolvedProperty);
-
-protected:
-    void suppress(CSSPropertyID unresolvedProperty);
-    bool isSuppressed(CSSPropertyID unresolvedProperty);
-    // CSSPropertyIDs that aren't deprecated return an empty string.
-    static String deprecationMessage(CSSPropertyID unresolvedProperty);
-
-    BitVector m_cssPropertyDeprecationBits;
-};
-
-} // namespace blink
-
-#endif // Deprecation_h