Make setNeedsActiveStyleUpdate mark treescope dirty only.

third_party/WebKit/Source/core/html/HTMLStyleElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLStyleElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLStyleElement.cpp b/third_party/WebKit/Source/core/html/HTMLStyleElement.cpp
index d3b1f7f60e7d91a49bc874ca05ee8f9b2a3de1bc..a4b661c85b6a82767ead7bb5386405aba9186a2b 100644
--- a/third_party/WebKit/Source/core/html/HTMLStyleElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLStyleElement.cpp
@@ -57,8 +57,10 @@ void HTMLStyleElement::parseAttribute(const QualifiedName& name,
   } else if (name == mediaAttr && isConnected() && document().isActive() &&
              m_sheet) {
     m_sheet->setMediaQueries(MediaQuerySet::create(value));
-    document().styleEngine().setNeedsActiveStyleUpdate(m_sheet.get(),
-                                                       FullStyleUpdate);
+    document().styleEngine().setNeedsActiveStyleUpdate(treeScope());
+    // TODO(rune@opera.com): resolverChanged() can be removed once stylesheet
+    // updates are async. https://crbug.com/567021
+    document().styleEngine().resolverChanged(FullStyleUpdate);
   } else {
     HTMLElement::parseAttribute(name, oldValue, value);
   }