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

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

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPaintStroke.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPaintStroke.cpp b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPaintStroke.cpp
index 9398d202727a482bd83710c49040af2c8a177f8b..73685dc7ed1e9597f42b7da12beb464892347d8a 100644
--- a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPaintStroke.cpp
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPaintStroke.cpp
@@ -14,17 +14,17 @@
 
 const CSSValue* CSSPropertyAPIPaintStroke::parseSingleValue(
     CSSParserTokenRange& range,
-    const CSSParserContext& context) {
+    const CSSParserContext* context) {
   if (range.peek().id() == CSSValueNone)
     return CSSPropertyParserHelpers::consumeIdent(range);
-  CSSURIValue* url = CSSPropertyParserHelpers::consumeUrl(range, &context);
+  CSSURIValue* url = CSSPropertyParserHelpers::consumeUrl(range, context);
   if (url) {
     CSSValue* parsedValue = nullptr;
     if (range.peek().id() == CSSValueNone) {
       parsedValue = CSSPropertyParserHelpers::consumeIdent(range);
     } else {
       parsedValue =
-          CSSPropertyParserHelpers::consumeColor(range, context.mode());
+          CSSPropertyParserHelpers::consumeColor(range, context->mode());
     }
     if (parsedValue) {
       CSSValueList* values = CSSValueList::createSpaceSeparated();
@@ -34,7 +34,7 @@
     }
     return url;
   }
-  return CSSPropertyParserHelpers::consumeColor(range, context.mode());
+  return CSSPropertyParserHelpers::consumeColor(range, context->mode());
 }
 
 }  // namespace blink