In WinAura, also kill the Metro viewer process in AttemptExit().

chrome/test/base/testing_browser_process.h

 // 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.
 
 // An implementation of BrowserProcess for unit tests that fails for most
 // services. By preventing creation of services, we reduce dependencies and
 // keep the profile clean. Clients of this class must handle the NULL return
 // value, however.
 
 #ifndef CHROME_TEST_BASE_TESTING_BROWSER_PROCESS_H_
@@ skipping 95 matching lines @@
   virtual PnaclComponentInstaller* pnacl_component_installer() OVERRIDE;
   virtual BookmarkPromptController* bookmark_prompt_controller() OVERRIDE;
   virtual chrome::MediaFileSystemRegistry*
       media_file_system_registry() OVERRIDE;
   virtual void PlatformSpecificCommandLineProcessing(
       const CommandLine& command_line) OVERRIDE;
   virtual bool created_local_state() const OVERRIDE;
 
 #if defined(OS_WIN) && defined(USE_AURA)
   virtual void OnMetroViewerProcessTerminated() OVERRIDE {}
+  virtual void TerminateMetroViewerProcess() OVERRIDE {}
 #endif
 
   // Set the local state for tests. Consumer is responsible for cleaning it up
   // afterwards (using ScopedTestingLocalState, for example).
   void SetLocalState(PrefService* local_state);
   void SetProfileManager(ProfileManager* profile_manager);
   void SetIOThread(IOThread* io_thread);
   void SetBrowserPolicyConnector(policy::BrowserPolicyConnector* connector);
   void SetSafeBrowsingService(SafeBrowsingService* sb_service);
   void SetBookmarkPromptController(BookmarkPromptController* controller);
@@ skipping 29 matching lines @@
   PrefService* local_state_;
   IOThread* io_thread_;
   net::URLRequestContextGetter* system_request_context_;
 
   scoped_ptr<BrowserProcessPlatformPart> platform_part_;
 
   DISALLOW_COPY_AND_ASSIGN(TestingBrowserProcess);
 };
 
 #endif  // CHROME_TEST_BASE_TESTING_BROWSER_PROCESS_H_