Ensure tests have an active task runner

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 <map>
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/format_macros.h"
 #include "base/memory/scoped_vector.h"
@@ skipping 359 matching lines @@
   }
 
   void DisablePrerender() {
     profile_.GetPrefs()->SetInteger(
         prefs::kNetworkPredictionOptions,
         chrome_browser_net::NETWORK_PREDICTION_NEVER);
   }
 
  private:
   // Needed to pass PrerenderManager's DCHECKs.
+  base::MessageLoop message_loop_;
   TestingProfile profile_;
-  base::MessageLoop message_loop_;
   content::TestBrowserThread ui_thread_;
   scoped_ptr<UnitTestPrerenderManager> prerender_manager_;
   scoped_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());
@@ skipping 1171 matching lines @@
   CHECK(prerender_handle.get());
   EXPECT_TRUE(prerender_handle->IsPrerendering());
   EXPECT_TRUE(prerender_contents->prerendering_has_started());
   EXPECT_EQ(prerender_contents, prerender_handle->contents());
   EXPECT_EQ(ORIGIN_INSTANT, prerender_handle->contents()->origin());
   ASSERT_EQ(prerender_contents, prerender_manager()->FindAndUseEntry(url));
   EXPECT_FALSE(prerender_handle->IsPrerendering());
 }
 
 }  // namespace prerender