Remove orphaned pages from Oilpan

third_party/WebKit/Source/platform/heap/PersistentNode.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 "platform/heap/PersistentNode.h"
 
 #include "base/debug/alias.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
@@ skipping 147 matching lines @@
       // object.
       CrossThreadPersistent<DummyGCBase>* persistent =
           reinterpret_cast<CrossThreadPersistent<DummyGCBase>*>(
               slots->m_slot[i].self());
       ASSERT(persistent);
       void* rawObject = persistent->atomicGet();
       if (!rawObject)
         continue;
       BasePage* page = pageFromObject(rawObject);
       ASSERT(page);
-      // The main thread will upon detach just mark its heap pages as orphaned,
-      // but not invalidate its CrossThreadPersistent<>s.
-      if (page->orphaned())
-        continue;
       if (page->arena()->getThreadState() == threadState) {
         persistent->clear();
         ASSERT(slots->m_slot[i].isUnused());
       }
     }
     slots = slots->m_next;
   }
 }
 
 #if defined(ADDRESS_SANITIZER)
@@ skipping 11 matching lines @@
       }
     }
   }
 #if DCHECK_IS_ON()
   DCHECK_EQ(persistentCount, m_persistentRegion->m_persistentCount);
 #endif
 }
 #endif
 
 }  // namespace blink