Make img referrerpolicy attribute runtime-enabled

Source/core/html/parser/HTMLPreloadScanner.cpp

Index: Source/core/html/parser/HTMLPreloadScanner.cpp
diff --git a/Source/core/html/parser/HTMLPreloadScanner.cpp b/Source/core/html/parser/HTMLPreloadScanner.cpp
index e6766cfafb5f0df5fc1c175c9f789ef5f79de5dc..153d8057989af14955e3e65d7e126bc88ac3045c 100644
--- a/Source/core/html/parser/HTMLPreloadScanner.cpp
+++ b/Source/core/html/parser/HTMLPreloadScanner.cpp
@@ -198,7 +198,7 @@ public:
         }
 
         // The element's 'referrerpolicy' attribute (if present) takes precedence over the document's referrer policy.
-        ReferrerPolicy referrerPolicy = m_referrerPolicy != ReferrerPolicyDefault ? m_referrerPolicy : documentReferrerPolicy;
+        ReferrerPolicy referrerPolicy = (m_referrerPolicy != ReferrerPolicyDefault && RuntimeEnabledFeatures::referrerPolicyAttributeEnabled()) ? m_referrerPolicy : documentReferrerPolicy;
         OwnPtr<PreloadRequest> request = PreloadRequest::create(initiatorFor(m_tagImpl), position, m_urlToLoad, predictedBaseURL, resourceType(), referrerPolicy, resourceWidth, clientHintsPreferences, requestType);
         if (isCORSEnabled())
             request->setCrossOriginEnabled(allowStoredCredentials());
@@ -241,7 +241,7 @@ private:
                 m_srcsetImageCandidate = bestFitSourceForSrcsetAttribute(m_mediaValues->devicePixelRatio(), m_sourceSize, m_srcsetAttributeValue);
                 setUrlToLoad(bestFitSourceForImageAttributes(m_mediaValues->devicePixelRatio(), m_sourceSize, m_imgSrcUrl, m_srcsetImageCandidate), AllowURLReplacement);
             }
-        } else if (!m_referrerPolicySet && match(attributeName, referrerpolicyAttr) && !attributeValue.isNull()) {
+        } else if (!m_referrerPolicySet && RuntimeEnabledFeatures::referrerPolicyAttributeEnabled() && match(attributeName, referrerpolicyAttr) && !attributeValue.isNull()) {
             m_referrerPolicySet = true;
             SecurityPolicy::referrerPolicyFromString(attributeValue, &m_referrerPolicy);
         }