Revert of Implements CSSPropertyAPI for the margin properties.

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIWebkitMargin.cpp

-// Copyright 2017 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.
-
-#include "core/css/properties/CSSPropertyAPIWebkitMargin.h"
-
-#include "core/css/parser/CSSParserContext.h"
-#include "core/css/parser/CSSPropertyParserHelpers.h"
-#include "core/css/properties/CSSPropertyMarginUtils.h"
-
-namespace blink {
-
-const CSSValue* CSSPropertyAPIWebkitMargin::parseSingleValue(
-    CSSParserTokenRange& range,
-    const CSSParserContext* context) {
-  return CSSPropertyMarginUtils::consumeMarginOrOffset(
-      range, context->mode(), CSSPropertyParserHelpers::UnitlessQuirk::Forbid);
-}
-
-}  // namespace blink