Make setNeedsActiveStyleUpdate mark treescope dirty only.

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

Index: third_party/WebKit/Source/core/html/LinkStyle.cpp
diff --git a/third_party/WebKit/Source/core/html/LinkStyle.cpp b/third_party/WebKit/Source/core/html/LinkStyle.cpp
index 4a3297d1c4fea51b953efa142e0df9dac0edd0a3..574106191cf25928b392afbdd58f77fd65e2b923 100644
--- a/third_party/WebKit/Source/core/html/LinkStyle.cpp
+++ b/third_party/WebKit/Source/core/html/LinkStyle.cpp
@@ -387,10 +387,11 @@ void LinkStyle::process() {
 
   if (loadStylesheetIfNeeded(builder, type) == NotNeeded && m_sheet) {
     // we no longer contain a stylesheet, e.g. perhaps rel or type was changed
-    StyleSheet* removedSheet = m_sheet.get();
     clearSheet();
-    document().styleEngine().setNeedsActiveStyleUpdate(removedSheet,
-                                                       FullStyleUpdate);
+    document().styleEngine().setNeedsActiveStyleUpdate(m_owner->treeScope());
+    // TODO(rune@opera.com): resolverChanged() can be removed once stylesheet
+    // updates are async. https://crbug.com/567021
+    document().styleEngine().resolverChanged(FullStyleUpdate);
   }
 }