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

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

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyAPIZoom.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIZoom.cpp b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIZoom.cpp
index bbf86d375e3c2f1b3361c43c1798eab9f4440f09..a19dc0705bdbb32081c6954ec61c8ff2fd845e06 100644
--- a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIZoom.cpp
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIZoom.cpp
@@ -12,7 +12,7 @@
 
 const CSSValue* CSSPropertyAPIZoom::parseSingleValue(
     CSSParserTokenRange& range,
-    const CSSParserContext& context) {
+    const CSSParserContext* context) {
   const CSSParserToken& token = range.peek();
   CSSValue* zoom = nullptr;
   if (token.type() == IdentToken) {
@@ -32,11 +32,11 @@
            toCSSPrimitiveValue(zoom)->getDoubleValue() == 1) ||
           (token.type() == PercentageToken &&
            toCSSPrimitiveValue(zoom)->getDoubleValue() == 100)))
-      context.count(UseCounter::CSSZoomNotEqualToOne);
+      context->count(UseCounter::CSSZoomNotEqualToOne);
     if (token.id() == CSSValueReset)
-      context.countDeprecation(UseCounter::CSSZoomReset);
+      context->countDeprecation(UseCounter::CSSZoomReset);
     if (token.id() == CSSValueDocument)
-      context.countDeprecation(UseCounter::CSSZoomDocument);
+      context->countDeprecation(UseCounter::CSSZoomDocument);
   }
   return zoom;
 }