Add the ability to unload the HistoryBackend....

chrome/test/testing_profile.h

 // Copyright (c) 2009 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.
 
 #ifndef CHROME_TEST_TESTING_PROFILE_H_
 #define CHROME_TEST_TESTING_PROFILE_H_
 
 #include "base/base_paths.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
@@ skipping 71 matching lines @@
   virtual SSLHostState* GetSSLHostState() { return NULL; }
   virtual net::StrictTransportSecurityState* GetStrictTransportSecurityState() {
     return NULL;
   }
   virtual FaviconService* GetFaviconService(ServiceAccessType access) {
     return NULL;
   }
   virtual HistoryService* GetHistoryService(ServiceAccessType access) {
     return history_service_.get();
   }
+  virtual HistoryService* GetHistoryServiceWithoutCreating() {
+    return history_service_.get();
+  }
   void set_has_history_service(bool has_history_service) {
     has_history_service_ = has_history_service;
   }
   virtual WebDataService* GetWebDataService(ServiceAccessType access) {
     return NULL;
   }
   virtual PasswordStore* GetPasswordStore(ServiceAccessType access) {
     return NULL;
   }
   virtual PrefService* GetPrefs() {
@@ skipping 113 matching lines @@
 
   std::wstring id_;
 
   bool off_the_record_;
 
   // Did the last session exit cleanly? Default is true.
   bool last_session_exited_cleanly_;
 };
 
 #endif  // CHROME_TEST_TESTING_PROFILE_H_