Update base/ to use WeakPtr<T>::get() instead of implicit "operator T*"

base/observer_list.h

 // Copyright (c) 2011 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 BASE_OBSERVER_LIST_H__
 #define BASE_OBSERVER_LIST_H__
 
 #include <algorithm>
 #include <limits>
 #include <vector>
@@ skipping 71 matching lines @@
     Iterator(ObserverListBase<ObserverType>& list)
         : list_(list.AsWeakPtr()),
           index_(0),
           max_index_(list.type_ == NOTIFY_ALL ?
                      std::numeric_limits<size_t>::max() :
                      list.observers_.size()) {
       ++list_->notify_depth_;
     }
 
     ~Iterator() {
-      if (list_ && --list_->notify_depth_ == 0)
+      if (list_.get() && --list_->notify_depth_ == 0)
         list_->Compact();
     }
 
     ObserverType* GetNext() {
-      if (!list_)
+      if (!list_.get())
         return NULL;
       ListType& observers = list_->observers_;
       // Advance if the current element is null
       size_t max_index = std::min(max_index_, observers.size());
       while (index_ < max_index && !observers[index_])
         ++index_;
       return index_ < max_index ? observers[index_++] : NULL;
     }
 
    private:
@@ skipping 99 matching lines @@
   do {                                                               \
     if ((observer_list).might_have_observers()) {                    \
       ObserverListBase<ObserverType>::Iterator it(observer_list);    \
       ObserverType* obs;                                             \
       while ((obs = it.GetNext()) != NULL)                           \
         obs->func;                                                   \
     }                                                                \
   } while (0)
 
 #endif  // BASE_OBSERVER_LIST_H__