'data:' may not be used as a document's base URL.

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 5a9b143e36769e19e3ea4979c85d03b5183815ef..7236302e033dc536640579bb826da73e88410c4c 100644
--- a/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
+++ b/third_party/WebKit/Source/core/html/parser/HTMLPreloadScanner.cpp
@@ -862,7 +862,8 @@ void TokenPreloadScanner::updatePredictedBaseURL(const Token& token) {
           token.getAttributeItem(hrefAttr)) {
     KURL url(m_documentURL, stripLeadingAndTrailingHTMLSpaces(
                                 hrefAttribute->value8BitIfNecessary()));
-    m_predictedBaseElementURL = url.isValid() ? url.copy() : KURL();
+    m_predictedBaseElementURL =
+        url.isValid() && !url.protocolIsData() ? url.copy() : KURL();
   }
 }