Fix leak: properly destroy TimezoneResolver instance.

chrome/browser/browser_process_platform_part_chromeos.cc

 // Copyright (c) 2013 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/browser_process_platform_part_chromeos.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/time/default_tick_clock.h"
 #include "base/time/tick_clock.h"
@@ skipping 108 matching lines @@
         base::Bind(&chromeos::system::ApplyTimeZone),
         base::Bind(&chromeos::DelayNetworkCall,
                    base::TimeDelta::FromMilliseconds(
                        chromeos::kDefaultNetworkRetryDelayMS)),
         g_browser_process->local_state()));
   }
   return timezone_resolver_.get();
 }
 
 void BrowserProcessPlatformPart::StartTearDown() {
+  // interactive_ui_tests check for memory leaks before this object is
+  // destroyed.  So we need to destroy |timezone_resolver_| here.
+  timezone_resolver_.reset();
   profile_helper_.reset();
 }
 
 scoped_ptr<policy::BrowserPolicyConnector>
 BrowserProcessPlatformPart::CreateBrowserPolicyConnector() {
   return scoped_ptr<policy::BrowserPolicyConnector>(
       new policy::BrowserPolicyConnectorChromeOS());
 }
 
 void BrowserProcessPlatformPart::CreateProfileHelper() {
   DCHECK(!created_profile_helper_ && profile_helper_.get() == NULL);
   created_profile_helper_ = true;
   profile_helper_.reset(new chromeos::ProfileHelper());
 }