Fix TestBrowserThread destruction order in CrOS tests.

chrome/browser/chromeos/net/wake_on_wifi_manager_unittest.cc

 // Copyright 2014 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/net/wake_on_wifi_connection_observer.h"
 #include "chrome/browser/services/gcm/fake_gcm_profile_service.h"
 #include "chrome/browser/services/gcm/gcm_profile_service_factory.h"
 #include "chrome/test/base/testing_profile.h"
 #include "chromeos/network/mock_network_device_handler.h"
 #include "content/public/test/test_browser_thread_bundle.h"
@@ skipping 13 matching lines @@
 }
 
 class WakeOnWifiObserverTest : public ::testing::Test {
  public:
   WakeOnWifiObserverTest() {
     gcm::GCMProfileServiceFactory::GetInstance()->SetTestingFactory(
         &profile_, &BuildFakeGCMProfileService);
   }
   ~WakeOnWifiObserverTest() override {}
 
+ private:
+  // Must outlive |profile_|.
+  content::TestBrowserThreadBundle thread_bundle_;
+
  protected:
   StrictMock<MockNetworkDeviceHandler> mock_network_device_handler_;
   TestingProfile profile_;
 
  private:
-  content::TestBrowserThreadBundle thread_bundle_;
-
   DISALLOW_COPY_AND_ASSIGN(WakeOnWifiObserverTest);
 };
 
 }  // namespace
 
 TEST_F(WakeOnWifiObserverTest, TestWakeOnWifiPacketAdd) {
   WakeOnWifiConnectionObserver observer(
       &profile_, false, WakeOnWifiManager::WAKE_ON_WIFI_PACKET,
       &mock_network_device_handler_);
 
@@ skipping 34 matching lines @@
       &mock_network_device_handler_);
 
   EXPECT_CALL(mock_network_device_handler_,
               RemoveWifiWakeOnPacketConnection(_, _, _))
       .Times(0);
 
   observer.RemoveWakeOnPacketConnection();
 }
 
 }  // namespace chromeos