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

chrome/browser/policy/policy_service_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.
 
 #include "chrome/browser/policy/policy_service_impl.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 38 matching lines @@
 }
 
 void PolicyServiceImpl::RemoveObserver(PolicyDomain domain,
                                        PolicyService::Observer* observer) {
   ObserverMap::iterator it = observers_.find(domain);
   if (it == observers_.end()) {
     NOTREACHED();
     return;
   }
   it->second->RemoveObserver(observer);
-  if (it->second->size() == 0) {
+  if (!it->second->might_have_observers()) {
     delete it->second;
     observers_.erase(it);
   }
 }
 
 void PolicyServiceImpl::RegisterPolicyDomain(
     scoped_refptr<const PolicyDomainDescriptor> descriptor) {
   domain_descriptors_[descriptor->domain()] = descriptor;
   for (Iterator it = providers_.begin(); it != providers_.end(); ++it)
     (*it)->RegisterPolicyDomain(descriptor);
@@ skipping 147 matching lines @@
   if (refresh_pending_.empty() && !refresh_callbacks_.empty()) {
     std::vector<base::Closure> callbacks;
     callbacks.swap(refresh_callbacks_);
     std::vector<base::Closure>::iterator it;
     for (it = callbacks.begin(); it != callbacks.end(); ++it)
       it->Run();
   }
 }
 
 }  // namespace policy