Fix the oilpan build break after r367789.

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/NodeTraversal.h"
 #include "core/dom/shadow/InsertionPoint.h"
@@ skipping 10 matching lines @@
 static void detachNotAssignedNode(Node& node)
 {
     if (node.layoutObject())
         node.lazyReattachIfAttached();
 }
 
 void SlotAssignment::resolveAssignment(const ShadowRoot& shadowRoot)
 {
     m_assignment.clear();
 
-    using Name2Slot = HashMap<AtomicString, HTMLSlotElement*>;
+    using Name2Slot = WillBeHeapHashMap<AtomicString, RefPtrWillBeMember<HTMLSlotElement>>;

[tkent, 2016/01/06 08:41:21]

The original code uses raw pointers, so you may use RawPtrWillBeMember<> instead
of RefPtrWillBeMember<>.
Of course RefPtrWillBeMember works well.

[hayato, 2016/01/06 08:55:51]

Ditto.

     Name2Slot name2slot;
-    HTMLSlotElement* defaultSlot = nullptr;
-    Vector<HTMLSlotElement*> slots;
+    RefPtrWillBeMember<HTMLSlotElement> defaultSlot = nullptr;

[sof, 2016/01/06 08:40:30]

If you really want to keep a RefPtr<> on the non-Oilpan side, then
RefPtrWillBeRawPtr<> is the transition type to use.

If RefPtr<> usage isn't merited, then leaving this as-was (HTMLSlotElement*)
would be appropriate.

[hayato, 2016/01/06 08:55:51]

Done. I reverted this so that it uses a raw pointer.
We do not need to guard a slot here.

+    WillBeHeapVector<RefPtrWillBeMember<HTMLSlotElement>> slots;
 
     // TODO(hayato): Cache slots elements so that we do not have to travese the shadow tree. See ShadowRoot::descendantInsertionPoints()
     for (HTMLSlotElement& slot : Traversal<HTMLSlotElement>::descendantsOf(shadowRoot)) {
         slot.clearDistribution();
 
         slots.append(&slot);
 
         AtomicString name = slot.fastGetAttribute(HTMLNames::nameAttr);
         if (name.isNull() || name.isEmpty()) {
             if (!defaultSlot)
@@ skipping 46 matching lines @@
 }
 
 DEFINE_TRACE(SlotAssignment)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_assignment);
 #endif
 }
 
 } // namespace blink