Make sure media query results are re-collected.

third_party/WebKit/Source/core/dom/StyleEngine.cpp

Index: third_party/WebKit/Source/core/dom/StyleEngine.cpp
diff --git a/third_party/WebKit/Source/core/dom/StyleEngine.cpp b/third_party/WebKit/Source/core/dom/StyleEngine.cpp
index fca51cb7fe1b23c3ed2f54a17b62aa5a15f9faf1..3830d87b66763f0d02f4d2cd5d41875d5d62bfe0 100644
--- a/third_party/WebKit/Source/core/dom/StyleEngine.cpp
+++ b/third_party/WebKit/Source/core/dom/StyleEngine.cpp
@@ -238,6 +238,12 @@ void StyleEngine::modifiedStyleSheetCandidateNode(Node& node) {
   resolverChanged(AnalyzedStyleUpdate);
 }
 
+void StyleEngine::mediaQueriesChangedInScope(TreeScope& treeScope) {
+  if (ScopedStyleResolver* resolver = treeScope.scopedStyleResolver())
+    resolver->setNeedsAppendAllSheets();
+  setNeedsActiveStyleUpdate(treeScope);
+}
+
 void StyleEngine::watchedSelectorsChanged() {
   m_globalRuleSet.initWatchedSelectorsRuleSet(document());
   // TODO(rune@opera.com): Should be able to use RuleSetInvalidation here.