Evaluate MediaQueryLists on actual media changes only.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index 493f59e6f26c0a096c4b70c1e0bc39602692a0d1..f59497f5bfd0f94d5f4ff5f824e9f15be9b947ad 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -680,6 +680,7 @@ MediaQueryMatcher& Document::mediaQueryMatcher()
 
 void Document::mediaQueryAffectingValueChanged()
 {
+    m_evaluateMediaQueriesOnStyleRecalc = true;
     styleEngine()->clearMediaQueryRuleSetStyleSheets();
 }
 
@@ -3456,8 +3457,6 @@ void Document::styleResolverChanged(StyleResolverUpdateMode updateMode)
         m_pendingSheetLayout = IgnoreLayoutWithPendingSheets;
         renderView()->repaintViewAndCompositedLayers();
     }
-
-    m_evaluateMediaQueriesOnStyleRecalc = true;
 }
 
 void Document::styleResolverMayHaveChanged()