Add the ability to unload the HistoryBackend....

chrome/browser/automation/automation_profile_impl.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_BROWSER_AUTOMATION_AUTOMATION_PROFILE_IMPL_H_
 #define CHROME_BROWSER_AUTOMATION_AUTOMATION_PROFILE_IMPL_H_
 
 #include "chrome/browser/profile.h"
 #include "net/url_request/url_request_context.h"
 
@@ skipping 60 matching lines @@
   }
   virtual net::StrictTransportSecurityState* GetStrictTransportSecurityState() {
     return original_profile_->GetStrictTransportSecurityState();
   }
   virtual FaviconService* GetFaviconService(ServiceAccessType access) {
     return original_profile_->GetFaviconService(access);
   }
   virtual HistoryService* GetHistoryService(ServiceAccessType access) {
     return original_profile_->GetHistoryService(access);
   }
+  virtual HistoryService* GetHistoryServiceWithoutCreating() {
+    return original_profile_->GetHistoryServiceWithoutCreating();
+  }
   virtual WebDataService* GetWebDataService(ServiceAccessType access) {
     return original_profile_->GetWebDataService(access);
   }
   virtual PasswordStore* GetPasswordStore(ServiceAccessType access) {
     return original_profile_->GetPasswordStore(access);
   }
   virtual PrefService* GetPrefs() {
     return original_profile_->GetPrefs();
   }
   virtual TemplateURLModel* GetTemplateURLModel() {
@@ skipping 116 matching lines @@
   Profile* original_profile_;
   scoped_refptr<net::CookieStore> alternate_cookie_store_;
   scoped_refptr<URLRequestContext> alternate_reqeust_context_;
   int tab_handle_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(AutomationProfileImpl);
 };
 
 #endif  // CHROME_BROWSER_AUTOMATION_AUTOMATION_PROFILE_IMPL_H_