Revert of Changed CSSParserContext argument from * to & for null safety.

third_party/WebKit/Source/core/css/properties/CSSPropertyAPITextIndent.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/CSSPropertyAPITextIndent.h"
 
 #include "core/css/CSSValueList.h"
 #include "core/css/parser/CSSParserContext.h"
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
 const CSSValue* CSSPropertyAPITextIndent::parseSingleValue(
     CSSParserTokenRange& range,
-    const CSSParserContext& context) {
+    const CSSParserContext* context) {
   // [ <length> | <percentage> ] && hanging? && each-line?
   // Keywords only allowed when css3Text is enabled.
   CSSValueList* list = CSSValueList::createSpaceSeparated();
 
   bool hasLengthOrPercentage = false;
   bool hasEachLine = false;
   bool hasHanging = false;
 
   do {
     if (!hasLengthOrPercentage) {
       if (CSSValue* textIndent =
               CSSPropertyParserHelpers::consumeLengthOrPercent(
-                  range, context.mode(), ValueRangeAll,
+                  range, context->mode(), ValueRangeAll,
                   CSSPropertyParserHelpers::UnitlessQuirk::Allow)) {
         list->append(*textIndent);
         hasLengthOrPercentage = true;
         continue;
       }
     }
 
     if (RuntimeEnabledFeatures::css3TextEnabled()) {
       CSSValueID id = range.peek().id();
       if (!hasEachLine && id == CSSValueEachLine) {
@@ skipping 10 matching lines @@
     return nullptr;
   } while (!range.atEnd());
 
   if (!hasLengthOrPercentage)
     return nullptr;
 
   return list;
 }
 
 }  // namespace blink