Ensure CSS scanner does not mark preloads as referenced

third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.cpp

Index: third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.cpp b/third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.cpp
index ede7f729a8ecd5e84f3b29d4a2a5e259f8e10961..920d5b80baed70ae291b6dbfe054b5a447c1a01d 100644
--- a/third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.cpp
+++ b/third_party/WebKit/Source/core/html/parser/CSSPreloadScanner.cpp
@@ -257,7 +257,7 @@ CSSPreloaderResourceClient::CSSPreloaderResourceClient(
                    : ScanOnly),
       m_preloader(preloader),
       m_resource(toCSSStyleSheetResource(resource)) {
-  m_resource->addClient(this);
+  m_resource->addClient(this, Resource::DontMarkAsReferenced);
 }
 
 CSSPreloaderResourceClient::~CSSPreloaderResourceClient() {}