Make CSSParserContext be garbage collected.

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

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyAPIOffsetPosition.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIOffsetPosition.cpp b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIOffsetPosition.cpp
index 74f2eb7aba753c5f9e5a477e42c9a9416c4010f2..1fc270d4e419b9acf92ce357155aef2f150c5ff1 100644
--- a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIOffsetPosition.cpp
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIOffsetPosition.cpp
@@ -13,16 +13,16 @@ namespace blink {
 
 const CSSValue* CSSPropertyAPIOffsetPosition::parseSingleValue(
     CSSParserTokenRange& range,
-    const CSSParserContext& context) {
+    const CSSParserContext* context) {
   CSSValueID id = range.peek().id();
   if (id == CSSValueAuto)
     return CSSPropertyParserHelpers::consumeIdent(range);
   CSSValue* value = CSSPropertyParserHelpers::consumePosition(
-      range, context.mode(), CSSPropertyParserHelpers::UnitlessQuirk::Forbid);
+      range, context->mode(), CSSPropertyParserHelpers::UnitlessQuirk::Forbid);
 
   // Count when we receive a valid position other than 'auto'.
-  if (context.useCounter() && value && value->isValuePair())
-    context.useCounter()->count(UseCounter::CSSOffsetInEffect);
+  if (context->isUseCounterRecordingEnabled() && value && value->isValuePair())
+    context->useCounter()->count(UseCounter::CSSOffsetInEffect);
   return value;
 }