Make DocumentOrderedMap take a const reference for scope

third_party/WebKit/Source/core/dom/shadow/SlotAssignment.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/shadow/SlotAssignment.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/Node.h"
 #include "core/dom/NodeTraversal.h"
@@ skipping 137 matching lines @@
   if (needs_collect_slots_)
     CollectSlots();
   return slots_;
 }
 
 HTMLSlotElement* SlotAssignment::FindSlot(const Node& node) {
   return node.IsSlotable() ? FindSlotByName(node.SlotName()) : nullptr;
 }
 
 HTMLSlotElement* SlotAssignment::FindSlotByName(const AtomicString& slot_name) {
-  return slot_map_->GetSlotByName(slot_name, owner_.Get());
+  return slot_map_->GetSlotByName(slot_name, *owner_);
 }
 
 void SlotAssignment::CollectSlots() {
   DCHECK(needs_collect_slots_);
   slots_.clear();
 
   slots_.ReserveCapacity(slot_count_);
   for (HTMLSlotElement& slot :
        Traversal<HTMLSlotElement>::DescendantsOf(*owner_)) {
     slots_.push_back(&slot);
   }
   needs_collect_slots_ = false;
   DCHECK_EQ(slots_.size(), slot_count_);
 }
 
 DEFINE_TRACE(SlotAssignment) {
   visitor->Trace(slots_);
   visitor->Trace(slot_map_);
   visitor->Trace(owner_);
 }
 
 }  // namespace blink