TestBrowserThreads must outlive TestProfiles and TestProfileManagers

chrome/browser/prerender/prerender_unittest.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 <stddef.h>
 #include <stdint.h>
 
 #include <map>
 #include <utility>
 
@@ skipping 387 matching lines @@
 
   void EnablePrerender() {
     profile_.GetPrefs()->SetInteger(
         prefs::kNetworkPredictionOptions,
         chrome_browser_net::NETWORK_PREDICTION_ALWAYS);
   }
 
  private:
   // Needed to pass PrerenderManager's DCHECKs.
   base::MessageLoop message_loop_;
+  content::TestBrowserThread ui_thread_;
+
   TestingProfile profile_;
-  content::TestBrowserThread ui_thread_;
   std::unique_ptr<UnitTestPrerenderManager> prerender_manager_;
   std::unique_ptr<PrerenderLinkManager> prerender_link_manager_;
   int last_prerender_id_;
   base::FieldTrialList field_trial_list_;
 };
 
 TEST_F(PrerenderTest, PrerenderRespectsDisableFlag) {
   RestorePrerenderMode restore_prerender_mode;
   ASSERT_TRUE(PrerenderManager::IsPrerenderingPossible());
   base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
@@ skipping 1364 matching lines @@
   prerender_contents->SetPrerenderMode(PREFETCH_ONLY);
   EXPECT_TRUE(prerender_contents->IsValidHttpMethod("GET"));
   EXPECT_TRUE(prerender_contents->IsValidHttpMethod("HEAD"));
   EXPECT_FALSE(prerender_contents->IsValidHttpMethod("OPTIONS"));
   EXPECT_FALSE(prerender_contents->IsValidHttpMethod("POST"));
   EXPECT_FALSE(prerender_contents->IsValidHttpMethod("TRACE"));
   EXPECT_FALSE(prerender_contents->IsValidHttpMethod("WHATEVER"));
 }
 
 }  // namespace prerender