Fix TestBrowserThread destruction order in CrOS tests.

chrome/browser/chromeos/net/wake_on_wifi_manager_unittest.cc

Index: chrome/browser/chromeos/net/wake_on_wifi_manager_unittest.cc
diff --git a/chrome/browser/chromeos/net/wake_on_wifi_manager_unittest.cc b/chrome/browser/chromeos/net/wake_on_wifi_manager_unittest.cc
index c3f2c06eff3ca14fd1f5e79a810f7bfc0113b5ae..b5b4a15acaa5fb6ccb038170cf92a9d93ea7ad37 100644
--- a/chrome/browser/chromeos/net/wake_on_wifi_manager_unittest.cc
+++ b/chrome/browser/chromeos/net/wake_on_wifi_manager_unittest.cc
@@ -31,13 +31,15 @@ class WakeOnWifiObserverTest : public ::testing::Test {
   }
   ~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);
 };