base: Make ScopedVector::clear() destroy elements.

ui/base/models/list_model.h

 // Copyright (c) 2012 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.
 
 #ifndef UI_BASE_MODELS_LIST_MODEL_H_
 #define UI_BASE_MODELS_LIST_MODEL_H_
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 29 matching lines @@
     DCHECK_LT(index, item_count());
     ItemType* item = items_[index];
     items_.weak_erase(items_.begin() + index);
     NotifyItemsRemoved(index, 1);
     return item;
   }
 
   // Removes all items from the model. This does NOT delete the items.
   void RemoveAll() {
     size_t count = item_count();
-    items_.clear();
+    items_.weak_clear();
     NotifyItemsRemoved(0, count);
   }
 
   // Removes an item at given |index| from the model and deletes it.
   void DeleteAt(size_t index) {
     delete RemoveAt(index);
   }
 
   // Removes and deletes all items from the model.
   void DeleteAll() {
@@ skipping 41 matching lines @@
  private:
   ScopedVector<ItemType> items_;
   ObserverList<ListModelObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ListModel<ItemType>);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_MODELS_LIST_MODEL_H_