Move <link rel=preconnect> crossorigin logic to the blink side

Source/platform/network/NetworkHints.cpp

Index: Source/platform/network/NetworkHints.cpp
diff --git a/Source/platform/network/NetworkHints.cpp b/Source/platform/network/NetworkHints.cpp
index db8118038a6115675945da4fbd3332bb5332963f..1d3232cd028b00f7539c35a862e17eee1a98560b 100644
--- a/Source/platform/network/NetworkHints.cpp
+++ b/Source/platform/network/NetworkHints.cpp
@@ -41,11 +41,12 @@ void prefetchDNS(const String& hostname)
 void preconnect(const KURL& url, const CrossOriginAttributeValue crossOrigin)
 {
     if (WebPrescientNetworking* prescientNetworking = Platform::current()->prescientNetworking()) {
+        bool allowCredentials = (crossOrigin != CrossOriginAttributeAnonymous);
         // TODO(yoav): Call only the crossorigin interface once everything is hooked up.
         if (crossOrigin == CrossOriginAttributeNotSet)
             prescientNetworking->preconnect(url);
         else
-            prescientNetworking->preconnect(url, crossOrigin);
+            prescientNetworking->preconnect(url, allowCredentials);
     }
 }