[Refactor] Moved scrollbar creation and deletion to ScrollbarManager

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  *               (http://www.torchmobile.com/)
@@ skipping 3599 matching lines @@
   for (LayoutObject* child = SlowFirstChild(); child;
        child = child->NextSibling()) {
     if (!child->CanBeSelectionLeaf())
       continue;
     if (child->GetSelectionState() == SelectionState::kNone)
       continue;
     child->SetShouldInvalidateSelection();
   }
 }
 
+bool LayoutObject::HasCustomScrollbarStyle() const {
+  return IsBox() && StyleRef().HasPseudoStyle(kPseudoIdScrollbar);
+}
+
 }  // namespace blink
 
 #ifndef NDEBUG
 
 void showTree(const blink::LayoutObject* object) {
   if (object)
     object->ShowTreeForThis();
   else
     WTFLogAlways("%s", "Cannot showTree. Root is (nil)");
 }
@@ skipping 15 matching lines @@
     const blink::LayoutObject* root = object1;
     while (root->Parent())
       root = root->Parent();
     root->ShowLayoutTreeAndMark(object1, "*", object2, "-", 0);
   } else {
     WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
   }
 }
 
 #endif