Revert of Catch up the spec update in CSS Rhythmic Sizing

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

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyAPILineHeightStep.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPILineHeightStep.cpp b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPILineHeightStep.cpp
deleted file mode 100644
index 130c513d3b1a7a37a05594196827c623bd3bc4f1..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPILineHeightStep.cpp
+++ /dev/null
@@ -1,20 +0,0 @@
-// 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/CSSPropertyAPILineHeightStep.h"
-
-#include "core/css/CSSValueList.h"
-#include "core/css/parser/CSSParserContext.h"
-#include "core/css/parser/CSSPropertyParserHelpers.h"
-
-namespace blink {
-
-const CSSValue* CSSPropertyAPILineHeightStep::parseSingleValue(
-    CSSParserTokenRange& range,
-    const CSSParserContext* context) {
-  return CSSPropertyParserHelpers::consumeLength(range, context->mode(),
-                                                 ValueRangeNonNegative);
-}
-
-}  // namespace blink