Eliminate implicit conversion from scoped_refptr<T> to T*

ppapi/shared_impl/callback_tracker.cc

 // Copyright (c) 2010 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 "ppapi/shared_impl/callback_tracker.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/compiler_specific.h"
@@ skipping 35 matching lines @@
 }
 
 CallbackTracker::~CallbackTracker() {
   // All callbacks must be aborted before destruction.
   CHECK_EQ(0u, pending_callbacks_.size());
 }
 
 void CallbackTracker::Add(
     const scoped_refptr<TrackedCallback>& tracked_callback) {
   PP_Resource resource_id = tracked_callback->resource_id();
-  DCHECK(pending_callbacks_[resource_id].find(tracked_callback) ==
+  DCHECK(pending_callbacks_[resource_id].find(tracked_callback.get()) ==
          pending_callbacks_[resource_id].end());
   pending_callbacks_[resource_id].insert(tracked_callback);
 }
 
 void CallbackTracker::Remove(
     const scoped_refptr<TrackedCallback>& tracked_callback) {
   CallbackSetMap::iterator map_it =
       pending_callbacks_.find(tracked_callback->resource_id());
   DCHECK(map_it != pending_callbacks_.end());
   CallbackSet::iterator it = map_it->second.find(tracked_callback);
   DCHECK(it != map_it->second.end());
   map_it->second.erase(it);
 
   // If there are no pending callbacks left for this ID, get rid of the entry.
   if (map_it->second.empty())
     pending_callbacks_.erase(map_it);
 }
 
 }  // namespace ppapi