Filter out data urls in the preload scanner

third_party/WebKit/Source/core/html/parser/PreloadRequest.h

Index: third_party/WebKit/Source/core/html/parser/PreloadRequest.h
diff --git a/third_party/WebKit/Source/core/html/parser/PreloadRequest.h b/third_party/WebKit/Source/core/html/parser/PreloadRequest.h
index 3b5722e5c01b10eb24cfb89c77f39959128f56a8..fd4f970b33ae8ee85a567a5553f7fafd678c90aa 100644
--- a/third_party/WebKit/Source/core/html/parser/PreloadRequest.h
+++ b/third_party/WebKit/Source/core/html/parser/PreloadRequest.h
@@ -42,6 +42,9 @@ class PreloadRequest {
       const ClientHintsPreferences& clientHintsPreferences =
           ClientHintsPreferences(),
       RequestType requestType = RequestTypePreload) {
+    // Never preload data or ref urls.
+    if (resourceURL.startsWith("#") || protocolIs(resourceURL, "data"))
+      return nullptr;
     return wrapUnique(new PreloadRequest(
         initiatorName, initiatorPosition, resourceURL, baseURL, resourceType,
         resourceWidth, clientHintsPreferences, requestType, referrerPolicy));