Update <video muted=""> handling to match spec

Source/core/html/parser/HTMLConstructionSite.cpp

Index: Source/core/html/parser/HTMLConstructionSite.cpp
diff --git a/Source/core/html/parser/HTMLConstructionSite.cpp b/Source/core/html/parser/HTMLConstructionSite.cpp
index e5e2efe67145ab056b18f4b28a1d6e567f18867c..7ebe9699c82775c1df9a640b23f6bc954d5a9359 100644
--- a/Source/core/html/parser/HTMLConstructionSite.cpp
+++ b/Source/core/html/parser/HTMLConstructionSite.cpp
@@ -744,6 +744,7 @@ PassRefPtr<Element> HTMLConstructionSite::createHTMLElement(AtomicHTMLToken* tok
     // to occur after construction to allow better code sharing here.
     RefPtr<Element> element = HTMLElementFactory::createHTMLElement(token->name(), document, form, true);
     setAttributes(element.get(), token, m_parserContentPolicy);
+    element->finishParsingAttributes();
     ASSERT(element->isHTMLElement());
     return element.release();
 }