Get rid of ensureStyleResolver().

sky/engine/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 217 matching lines @@
         m_inSynchronousPostLayout = true;
         performPostLayoutTasks();
         m_inSynchronousPostLayout = false;
     }
 
     Document* document = m_frame->document();
     if (wasViewportResized())
         document->notifyResizeForViewportUnits();
 
     // Viewport-dependent media queries may cause us to need completely different style information.
-    if (!document->styleResolver() || document->styleResolver()->mediaQueryAffectedByViewportChange()) {
+    if (document->styleResolver().mediaQueryAffectedByViewportChange()) {
         document->styleResolverChanged();
         document->mediaQueryAffectingValueChanged();
     } else {
         document->evaluateMediaQueryList();
     }
 
     document->updateRenderTreeIfNeeded();
     lifecycle().advanceTo(DocumentLifecycle::StyleClean);
 }
 
@@ skipping 660 matching lines @@
     totalObjects = 0;
 
     for (RenderObject* o = root; o; o = o->nextInPreOrder(root)) {
         ++totalObjects;
         if (o->needsLayout())
             ++needsLayoutObjects;
     }
 }
 
 } // namespace blink