Switch ObserverList::size() to ObserverList::might_have_observers() Pt.1

content/browser/loader/resource_dispatcher_host_impl.cc

 // 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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 
 #include <set>
 #include <vector>
@@ skipping 1795 matching lines @@
   }
   it->second->AddObserver(delegate);
 }
 
 void ResourceDispatcherHostImpl::UnregisterResourceMessageDelegate(
     const GlobalRequestID& id, ResourceMessageDelegate* delegate) {
   DCHECK(ContainsKey(delegate_map_, id));
   DelegateMap::iterator it = delegate_map_.find(id);
   DCHECK(it->second->HasObserver(delegate));
   it->second->RemoveObserver(delegate);
-  if (it->second->size() == 0) {
+  if (!it->second->might_have_observers()) {
     delete it->second;
     delegate_map_.erase(it);
   }
 }
 
 int ResourceDispatcherHostImpl::BuildLoadFlagsForRequest(
     const ResourceHostMsg_Request& request_data,
     int child_id,
     bool is_sync_load) {
   int load_flags = request_data.load_flags;
@@ skipping 44 matching lines @@
   if ((load_flags & net::LOAD_REPORT_RAW_HEADERS)
       && !policy->CanReadRawCookies(child_id)) {
     VLOG(1) << "Denied unauthorized request for raw headers";
     load_flags &= ~net::LOAD_REPORT_RAW_HEADERS;
   }
 
   return load_flags;
 }
 
 }  // namespace content