Add a warning whenever link preloads are not used

third_party/WebKit/Source/core/loader/LinkPreloadResourceClients.h

Index: third_party/WebKit/Source/core/loader/LinkPreloadResourceClients.h
diff --git a/third_party/WebKit/Source/core/loader/LinkPreloadResourceClients.h b/third_party/WebKit/Source/core/loader/LinkPreloadResourceClients.h
index 139b47cc99b56c8ca4dd89ffca9c50a491b85209..4a53c2fbb9f20cc68c04e4df236ed762fff04acc 100644
--- a/third_party/WebKit/Source/core/loader/LinkPreloadResourceClients.h
+++ b/third_party/WebKit/Source/core/loader/LinkPreloadResourceClients.h
@@ -69,7 +69,7 @@ private:
     LinkPreloadScriptResourceClient(LinkLoader* loader, ScriptResource* resource)
         : LinkPreloadResourceClient(loader)
     {
-        setResource(resource);
+        setResource(resource, Resource::DontMarkAsReferenced);
     }
 };
 
@@ -102,7 +102,7 @@ private:
     LinkPreloadStyleResourceClient(LinkLoader* loader, CSSStyleSheetResource* resource)
         : LinkPreloadResourceClient(loader)
     {
-        setResource(resource);
+        setResource(resource, Resource::DontMarkAsReferenced);
     }
 };
 
@@ -135,7 +135,7 @@ private:
     LinkPreloadImageResourceClient(LinkLoader* loader, ImageResource* resource)
         : LinkPreloadResourceClient(loader)
     {
-        setResource(resource);
+        setResource(resource, Resource::DontMarkAsReferenced);
     }
 };
 
@@ -168,7 +168,7 @@ private:
     LinkPreloadFontResourceClient(LinkLoader* loader, FontResource* resource)
         : LinkPreloadResourceClient(loader)
     {
-        setResource(resource);
+        setResource(resource, Resource::DontMarkAsReferenced);
     }
 };
 
@@ -201,7 +201,7 @@ private:
     LinkPreloadRawResourceClient(LinkLoader* loader, RawResource* resource)
         : LinkPreloadResourceClient(loader)
     {
-        setResource(resource);
+        setResource(resource, Resource::DontMarkAsReferenced);
     }
 };