Filter out data urls in the preload scanner

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

Index: third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp b/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
index b664912074081ba5a020b8c0980045d2d856b970..4f695c0a48af97023ffbfb36639ae7900964fe88 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
+++ b/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
@@ -244,6 +244,9 @@ class TokenPreloadScanner::StartTagScanner {
     std::unique_ptr<PreloadRequest> request = PreloadRequest::create(
         initiatorFor(m_tagImpl), position, m_urlToLoad, predictedBaseURL, type,
         referrerPolicy, resourceWidth, clientHintsPreferences, requestType);
+    if (!request)
+      return nullptr;
+
     request->setCrossOrigin(m_crossOrigin);
     request->setNonce(m_nonce);
     request->setCharset(charset());