contacts: Apply nits to ContactMap class.

chrome/browser/chromeos/contacts/contact_map.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/chromeos/contacts/contact_map.h"
 
 #include "chrome/browser/chromeos/contacts/contact.pb.h"
 
 namespace contacts {
 
 ContactMap::ContactMap() : contacts_deleter_(&contacts_) {}
 
 ContactMap::~ContactMap() {}
 
 const Contact* ContactMap::Find(const std::string& contact_id) const {
   Map::const_iterator it = contacts_.find(contact_id);
   return (it != contacts_.end()) ? it->second : NULL;
 }
 
 void ContactMap::Clear() {
   STLDeleteValues(&contacts_);
-  contacts_.clear();
 }
 
 void ContactMap::Merge(scoped_ptr<ScopedVector<Contact> > updated_contacts,
                        DeletedContactPolicy policy) {
   for (ScopedVector<Contact>::iterator it = updated_contacts->begin();
        it != updated_contacts->end(); ++it) {
     Contact* contact = *it;
     Map::iterator map_it = contacts_.find(contact->contact_id());
 
     if (contact->deleted() && policy == DROP_DELETED_CONTACTS) {
@@ skipping 26 matching lines @@
         base::Time::FromInternalValue(contact->update_time());
     if (!update_time.is_null() &&
         (max_update_time.is_null() || max_update_time < update_time)) {
       max_update_time = update_time;
     }
   }
   return max_update_time;
 }
 
 }  // namespace contacts