Add asserts to TestingProfile::CreateHistoryService to ensure files are deleted

chrome/test/base/testing_profile.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 "chrome/test/base/testing_profile.h"
 
 #include "build/build_config.h"
 
 #include "base/base_paths.h"
 #include "base/command_line.h"
@@ skipping 348 matching lines @@
   // It is up to the caller to create the history service if one is needed.
   FaviconServiceFactory::GetInstance()->SetTestingFactory(
       this, BuildFaviconService);
 }
 
 static BrowserContextKeyedService* BuildHistoryService(
     content::BrowserContext* profile) {
   return new HistoryService(static_cast<Profile*>(profile));
 }
 
-void TestingProfile::CreateHistoryService(bool delete_file, bool no_db) {
+bool TestingProfile::CreateHistoryService(bool delete_file, bool no_db) {
   DestroyHistoryService();
   if (delete_file) {
     base::FilePath path = GetPath();
     path = path.Append(chrome::kHistoryFilename);
-    base::DeleteFile(path, false);
+    if (!base::DeleteFile(path, false) || base::PathExists(path))
+      return false;
   }
   // This will create and init the history service.
   HistoryService* history_service = static_cast<HistoryService*>(
       HistoryServiceFactory::GetInstance()->SetTestingFactoryAndUse(
           this, BuildHistoryService));
   if (!history_service->Init(this->GetPath(),
                              BookmarkModelFactory::GetForProfile(this),
                              no_db)) {
     HistoryServiceFactory::GetInstance()->SetTestingFactoryAndUse(this, NULL);
   }
   // Disable WebHistoryService by default, since it makes network requests.
   WebHistoryServiceFactory::GetInstance()->SetTestingFactory(this, NULL);
+  return true;
 }
 
 void TestingProfile::DestroyHistoryService() {
   HistoryService* history_service =
       HistoryServiceFactory::GetForProfileWithoutCreating(this);
   if (!history_service)
     return;
 
   history_service->NotifyRenderProcessHostDestruction(0);
   history_service->SetOnBackendDestroyTask(base::MessageLoop::QuitClosure());
@@ skipping 413 matching lines @@
 
 scoped_ptr<TestingProfile> TestingProfile::Builder::Build() {
   DCHECK(!build_called_);
   build_called_ = true;
   return scoped_ptr<TestingProfile>(new TestingProfile(
       path_,
       delegate_,
       extension_policy_,
       pref_service_.Pass()));
 }