Fix memory leak.

chrome/browser/history/top_sites.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/history/top_sites.h"
 
 #include <algorithm>
 
 #include "app/l10n_util.h"
 #include "base/file_util.h"
@@ skipping 636 matching lines @@
   StartQueryForMostVisited();
 }
 
 void TopSites::AddBlacklistedURL(const GURL& url) {
   RemovePinnedURL(url);
   Value* dummy = Value::CreateNullValue();
   blacklist_->SetWithoutPathExpansion(GetURLHash(url), dummy);
 }
 
 bool TopSites::IsBlacklisted(const GURL& url) {
-  Value* dummy = Value::CreateNullValue();
-  bool result = blacklist_->GetWithoutPathExpansion(GetURLHash(url), &dummy);
+  bool result = blacklist_->HasKey(GetURLHash(url));
   return result;
 }
 
 void TopSites::RemoveBlacklistedURL(const GURL& url) {
   Value* dummy = NULL;
   blacklist_->RemoveWithoutPathExpansion(GetURLHash(url), &dummy);
 }
 
 void TopSites::ClearBlacklistedURLs() {
   blacklist_->Clear();
@@ skipping 155 matching lines @@
   DCHECK(ChromeThread::CurrentlyOn(ChromeThread::DB));
   db_.reset(new TopSitesDatabaseImpl());
   file_util::Delete(db_path_, false);
   if (!db_->Init(db_path_)) {
     NOTREACHED() << "Failed to initialize database.";
     return;
   }
 }
 
 }  // namespace history