Add the ability to unload the HistoryBackend....

chrome/browser/autocomplete/autocomplete_browsertest.cc

 // 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.
 
 #include "chrome/browser/autocomplete/autocomplete.h"
 #include "chrome/browser/autocomplete/autocomplete_edit.h"
 #include "chrome/browser/autocomplete/autocomplete_edit_view.h"
 #include "chrome/browser/autocomplete/autocomplete_popup_model.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/browser_window.h"
@@ skipping 32 matching lines @@
   }
 
   AutocompleteController* GetAutocompleteController() const {
     return GetLocationBar()->location_entry()->model()->popup_model()->
         autocomplete_controller();
   }
 
   void WaitForHistoryBackendToLoad() {
     HistoryService* history_service =
         browser()->profile()->GetHistoryService(Profile::EXPLICIT_ACCESS);
-    if (!history_service->backend_loaded()) {
+    if (!history_service->BackendLoaded()) {
       NotificationRegistrar registrar;
       registrar.Add(this, NotificationType::HISTORY_LOADED,
                     NotificationService::AllSources());
       ui_test_utils::RunMessageLoop();
     }
   }
 
   virtual void Observe(NotificationType type,
                        const NotificationSource& source,
                        const NotificationDetails& details) {
@@ skipping 68 matching lines @@
     location_bar->Revert();
 
     EXPECT_EQ(std::wstring(), location_bar->GetInputString());
     EXPECT_EQ(UTF8ToWide(chrome::kAboutBlankURL),
               location_bar->location_entry()->GetText());
     EXPECT_FALSE(location_bar->location_entry()->IsSelectAll());
     const AutocompleteResult& result = autocomplete_controller->result();
     EXPECT_TRUE(result.empty()) << AutocompleteResultAsString(result);
   }
 }