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

Source/core/html/HTMLMediaElement.cpp

Index: Source/core/html/HTMLMediaElement.cpp
diff --git a/Source/core/html/HTMLMediaElement.cpp b/Source/core/html/HTMLMediaElement.cpp
index f5fb8f9311ddbe67a339b11b7c983bc1d9e04ec9..f48b032844a0fad62657ee33cee8ead5666b9c78 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -423,6 +423,12 @@ void HTMLMediaElement::parseAttribute(const QualifiedName& name, const AtomicStr
     }
 }
 
+void HTMLMediaElement::finishParsingAttributes()
+{
+    if (fastHasAttribute(mutedAttr))
+        m_muted = true;
+}
+
 void HTMLMediaElement::finishParsingChildren()
 {
     HTMLElement::finishParsingChildren();
@@ -830,8 +836,6 @@ void HTMLMediaElement::loadResource(const KURL& url, ContentType& contentType, c
     if (!autoplay())
         setPlayerPreload();
 
-    if (fastHasAttribute(mutedAttr))
-        m_muted = true;
     updateVolume();
 
     ASSERT(!m_mediaSource);